Add support for uploading multiple epubs (#202)

Upload multiple files at once in sequence. Add retry button for files
that fail

## Summary

* **What is the goal of this PR?**
Add support for selecting multiple epub files in one go, before
uploading them all to the device
* **What changes are included?**
Allow multiple selections to be submitted to the input field.
Sends each file to the device one by one in a loop
Adds retry logic and UI for easy re-trying of failed uploads

Addresses #201 


button now says "Choose Files", and shows the number of files you
selected
<img width="506" height="199" alt="image"
src="https://github.com/user-attachments/assets/64b0b921-1e67-438e-9cd7-57d5466f2456"
/>

Shows which file is uploading:
<img width="521" height="283" alt="image"
src="https://github.com/user-attachments/assets/17b4d349-0698-4712-984c-b72fcdcb0918"
/>

Failed upload dialog:
<img width="851" height="441" alt="image"
src="https://github.com/user-attachments/assets/e8bf4aa6-d3d2-4c0b-9c7a-420e8c413033"
/>
<img width="834" height="641" alt="image"
src="https://github.com/user-attachments/assets/656a9732-3963-4844-94e3-4d8736f6d9d5"
/>

lib/Epub/Epub/Section.cpp

@@ -7,9 +7,9 @@
 #include "parsers/ChapterHtmlSlimParser.h"
 
 namespace {
-constexpr uint8_t SECTION_FILE_VERSION = 8;
-constexpr uint32_t HEADER_SIZE = sizeof(uint8_t) + sizeof(int) + sizeof(float) + sizeof(bool) + sizeof(uint16_t) +
-                                 sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t);
+constexpr uint8_t SECTION_FILE_VERSION = 9;
+constexpr uint32_t HEADER_SIZE = sizeof(uint8_t) + sizeof(int) + sizeof(float) + sizeof(bool) + sizeof(uint8_t) +
+                                 sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t);
 }  // namespace
 
 uint32_t Section::onPageComplete(std::unique_ptr<Page> page) {
@@ -30,19 +30,21 @@ uint32_t Section::onPageComplete(std::unique_ptr<Page> page) {
 }
 
 void Section::writeSectionFileHeader(const int fontId, const float lineCompression, const bool extraParagraphSpacing,
-                                     const uint16_t viewportWidth, const uint16_t viewportHeight) {
+                                     const uint8_t paragraphAlignment, const uint16_t viewportWidth,
+                                     const uint16_t viewportHeight) {
   if (!file) {
     Serial.printf("[%lu] [SCT] File not open for writing header\n", millis());
     return;
   }
   static_assert(HEADER_SIZE == sizeof(SECTION_FILE_VERSION) + sizeof(fontId) + sizeof(lineCompression) +
-                                   sizeof(extraParagraphSpacing) + sizeof(viewportWidth) + sizeof(viewportHeight) +
-                                   sizeof(pageCount) + sizeof(uint32_t),
+                                   sizeof(extraParagraphSpacing) + sizeof(paragraphAlignment) + sizeof(viewportWidth) +
+                                   sizeof(viewportHeight) + sizeof(pageCount) + sizeof(uint32_t),
                 "Header size mismatch");
   serialization::writePod(file, SECTION_FILE_VERSION);
   serialization::writePod(file, fontId);
   serialization::writePod(file, lineCompression);
   serialization::writePod(file, extraParagraphSpacing);
+  serialization::writePod(file, paragraphAlignment);
   serialization::writePod(file, viewportWidth);
   serialization::writePod(file, viewportHeight);
   serialization::writePod(file, pageCount);  // Placeholder for page count (will be initially 0 when written)
@@ -50,7 +52,8 @@ void Section::writeSectionFileHeader(const int fontId, const float lineCompressi
 }
 
 bool Section::loadSectionFile(const int fontId, const float lineCompression, const bool extraParagraphSpacing,
-                              const uint16_t viewportWidth, const uint16_t viewportHeight) {
+                              const uint8_t paragraphAlignment, const uint16_t viewportWidth,
+                              const uint16_t viewportHeight) {
   if (!SdMan.openFileForRead("SCT", filePath, file)) {
     return false;
   }
@@ -70,15 +73,17 @@ bool Section::loadSectionFile(const int fontId, const float lineCompression, con
     uint16_t fileViewportWidth, fileViewportHeight;
     float fileLineCompression;
     bool fileExtraParagraphSpacing;
+    uint8_t fileParagraphAlignment;
     serialization::readPod(file, fileFontId);
     serialization::readPod(file, fileLineCompression);
     serialization::readPod(file, fileExtraParagraphSpacing);
+    serialization::readPod(file, fileParagraphAlignment);
     serialization::readPod(file, fileViewportWidth);
     serialization::readPod(file, fileViewportHeight);
 
     if (fontId != fileFontId || lineCompression != fileLineCompression ||
-        extraParagraphSpacing != fileExtraParagraphSpacing || viewportWidth != fileViewportWidth ||
-        viewportHeight != fileViewportHeight) {
+        extraParagraphSpacing != fileExtraParagraphSpacing || paragraphAlignment != fileParagraphAlignment ||
+        viewportWidth != fileViewportWidth || viewportHeight != fileViewportHeight) {
       file.close();
       Serial.printf("[%lu] [SCT] Deserialization failed: Parameters do not match\n", millis());
       clearCache();
@@ -109,8 +114,8 @@ bool Section::clearCache() const {
 }
 
 bool Section::createSectionFile(const int fontId, const float lineCompression, const bool extraParagraphSpacing,
-                                const uint16_t viewportWidth, const uint16_t viewportHeight,
-                                const std::function<void()>& progressSetupFn,
+                                const uint8_t paragraphAlignment, const uint16_t viewportWidth,
+                                const uint16_t viewportHeight, const std::function<void()>& progressSetupFn,
                                 const std::function<void(int)>& progressFn) {
   constexpr uint32_t MIN_SIZE_FOR_PROGRESS = 50 * 1024;  // 50KB
   const auto localPath = epub->getSpineItem(spineIndex).href;
@@ -166,11 +171,13 @@ bool Section::createSectionFile(const int fontId, const float lineCompression, c
   if (!SdMan.openFileForWrite("SCT", filePath, file)) {
     return false;
   }
-  writeSectionFileHeader(fontId, lineCompression, extraParagraphSpacing, viewportWidth, viewportHeight);
+  writeSectionFileHeader(fontId, lineCompression, extraParagraphSpacing, paragraphAlignment, viewportWidth,
+                         viewportHeight);
   std::vector<uint32_t> lut = {};
 
   ChapterHtmlSlimParser visitor(
-      tmpHtmlPath, renderer, fontId, lineCompression, extraParagraphSpacing, viewportWidth, viewportHeight,
+      tmpHtmlPath, renderer, fontId, lineCompression, extraParagraphSpacing, paragraphAlignment, viewportWidth,
+      viewportHeight,
       [this, &lut](std::unique_ptr<Page> page) { lut.emplace_back(this->onPageComplete(std::move(page))); },
       progressFn);
   success = visitor.parseAndBuildPages();

lib/Epub/Epub/Section.h

@@ -14,8 +14,8 @@ class Section {
   std::string filePath;
   FsFile file;
 
-  void writeSectionFileHeader(int fontId, float lineCompression, bool extraParagraphSpacing, uint16_t viewportWidth,
-                              uint16_t viewportHeight);
+  void writeSectionFileHeader(int fontId, float lineCompression, bool extraParagraphSpacing, uint8_t paragraphAlignment,
+                              uint16_t viewportWidth, uint16_t viewportHeight);
   uint32_t onPageComplete(std::unique_ptr<Page> page);
 
  public:
@@ -28,11 +28,12 @@ class Section {
         renderer(renderer),
         filePath(epub->getCachePath() + "/sections/" + std::to_string(spineIndex) + ".bin") {}
   ~Section() = default;
-  bool loadSectionFile(int fontId, float lineCompression, bool extraParagraphSpacing, uint16_t viewportWidth,
-                       uint16_t viewportHeight);
+  bool loadSectionFile(int fontId, float lineCompression, bool extraParagraphSpacing, uint8_t paragraphAlignment,
+                       uint16_t viewportWidth, uint16_t viewportHeight);
   bool clearCache() const;
-  bool createSectionFile(int fontId, float lineCompression, bool extraParagraphSpacing, uint16_t viewportWidth,
-                         uint16_t viewportHeight, const std::function<void()>& progressSetupFn = nullptr,
+  bool createSectionFile(int fontId, float lineCompression, bool extraParagraphSpacing, uint8_t paragraphAlignment,
+                         uint16_t viewportWidth, uint16_t viewportHeight,
+                         const std::function<void()>& progressSetupFn = nullptr,
                          const std::function<void(int)>& progressFn = nullptr);
   std::unique_ptr<Page> loadPageFromSectionFile();
 };

lib/Epub/Epub/parsers/ChapterHtmlSlimParser.cpp

@@ -97,7 +97,7 @@ void XMLCALL ChapterHtmlSlimParser::startElement(void* userData, const XML_Char*
     if (strcmp(name, "br") == 0) {
       self->startNewTextBlock(self->currentTextBlock->getStyle());
     } else {
-      self->startNewTextBlock(TextBlock::JUSTIFIED);
+      self->startNewTextBlock((TextBlock::Style)self->paragraphAlignment);
     }
   } else if (matches(name, BOLD_TAGS, NUM_BOLD_TAGS)) {
     self->boldUntilDepth = std::min(self->boldUntilDepth, self->depth);
@@ -137,6 +137,21 @@ void XMLCALL ChapterHtmlSlimParser::characterData(void* userData, const XML_Char
       continue;
     }
 
+    // Skip soft-hyphen with UTF-8 representation (U+00AD) = 0xC2 0xAD
+    const XML_Char SHY_BYTE_1 = static_cast<XML_Char>(0xC2);
+    const XML_Char SHY_BYTE_2 = static_cast<XML_Char>(0xAD);
+    // 1. Check for the start of the 2-byte Soft Hyphen sequence
+    if (s[i] == SHY_BYTE_1) {
+      // 2. Check if the next byte exists AND if it completes the sequence
+      //    We must check i + 1 < len to prevent reading past the end of the buffer.
+      if ((i + 1 < len) && (s[i + 1] == SHY_BYTE_2)) {
+        // Sequence 0xC2 0xAD found!
+        // Skip the current byte (0xC2) and the next byte (0xAD)
+        i++;       // Increment 'i' one more time to skip the 0xAD byte
+        continue;  // Skip the rest of the loop and move to the next iteration
+      }
+    }
+
     // If we're about to run out of space, then cut the word off and start a new one
     if (self->partWordBufferIndex >= MAX_WORD_SIZE) {
       self->partWordBuffer[self->partWordBufferIndex] = '\0';
@@ -206,7 +221,7 @@ void XMLCALL ChapterHtmlSlimParser::endElement(void* userData, const XML_Char* n
 }
 
 bool ChapterHtmlSlimParser::parseAndBuildPages() {
-  startNewTextBlock(TextBlock::JUSTIFIED);
+  startNewTextBlock((TextBlock::Style)this->paragraphAlignment);
 
   const XML_Parser parser = XML_ParserCreate(nullptr);
   int done;

lib/Epub/Epub/parsers/ChapterHtmlSlimParser.h

@@ -33,6 +33,7 @@ class ChapterHtmlSlimParser {
   int fontId;
   float lineCompression;
   bool extraParagraphSpacing;
+  uint8_t paragraphAlignment;
   uint16_t viewportWidth;
   uint16_t viewportHeight;
 
@@ -46,7 +47,8 @@ class ChapterHtmlSlimParser {
  public:
   explicit ChapterHtmlSlimParser(const std::string& filepath, GfxRenderer& renderer, const int fontId,
                                  const float lineCompression, const bool extraParagraphSpacing,
-                                 const uint16_t viewportWidth, const uint16_t viewportHeight,
+                                 const uint8_t paragraphAlignment, const uint16_t viewportWidth,
+                                 const uint16_t viewportHeight,
                                  const std::function<void(std::unique_ptr<Page>)>& completePageFn,
                                  const std::function<void(int)>& progressFn = nullptr)
       : filepath(filepath),
@@ -54,6 +56,7 @@ class ChapterHtmlSlimParser {
         fontId(fontId),
         lineCompression(lineCompression),
         extraParagraphSpacing(extraParagraphSpacing),
+        paragraphAlignment(paragraphAlignment),
         viewportWidth(viewportWidth),
         viewportHeight(viewportHeight),
         completePageFn(completePageFn),

src/CrossPointSettings.cpp

@@ -12,7 +12,7 @@ CrossPointSettings CrossPointSettings::instance;
 namespace {
 constexpr uint8_t SETTINGS_FILE_VERSION = 1;
 // Increment this when adding new persisted settings fields
-constexpr uint8_t SETTINGS_COUNT = 10;
+constexpr uint8_t SETTINGS_COUNT = 11;
 constexpr char SETTINGS_FILE[] = "/.crosspoint/settings.bin";
 }  // namespace
 
@@ -37,6 +37,7 @@ bool CrossPointSettings::saveToFile() const {
   serialization::writePod(outputFile, fontFamily);
   serialization::writePod(outputFile, fontSize);
   serialization::writePod(outputFile, lineSpacing);
+  serialization::writePod(outputFile, paragraphAlignment);
   outputFile.close();
 
   Serial.printf("[%lu] [CPS] Settings saved to file\n", millis());
@@ -83,6 +84,8 @@ bool CrossPointSettings::loadFromFile() {
     if (++settingsRead >= fileSettingsCount) break;
     serialization::readPod(inputFile, lineSpacing);
     if (++settingsRead >= fileSettingsCount) break;
+    serialization::readPod(inputFile, paragraphAlignment);
+    if (++settingsRead >= fileSettingsCount) break;
   } while (false);
 
   inputFile.close();

src/CrossPointSettings.h

@@ -43,6 +43,7 @@ class CrossPointSettings {
   // Font size options
   enum FONT_SIZE { SMALL = 0, MEDIUM = 1, LARGE = 2, EXTRA_LARGE = 3 };
   enum LINE_COMPRESSION { TIGHT = 0, NORMAL = 1, WIDE = 2 };
+  enum PARAGRAPH_ALIGNMENT { JUSTIFIED = 0, LEFT_ALIGN = 1, CENTER_ALIGN = 2, RIGHT_ALIGN = 3 };
 
   // Sleep screen settings
   uint8_t sleepScreen = DARK;
@@ -62,6 +63,7 @@ class CrossPointSettings {
   uint8_t fontFamily = BOOKERLY;
   uint8_t fontSize = MEDIUM;
   uint8_t lineSpacing = NORMAL;
+  uint8_t paragraphAlignment = JUSTIFIED;
 
   ~CrossPointSettings() = default;
 

src/activities/Activity.h

@@ -22,4 +22,5 @@ class Activity {
   virtual void onExit() { Serial.printf("[%lu] [ACT] Exiting activity: %s\n", millis(), name.c_str()); }
   virtual void loop() {}
   virtual bool skipLoopDelay() { return false; }
+  virtual bool preventAutoSleep() { return false; }
 };

src/activities/boot_sleep/SleepActivity.cpp

@@ -5,8 +5,6 @@
 #include <SDCardManager.h>
 #include <Xtc.h>
 
-#include <vector>
-
 #include "CrossPointSettings.h"
 #include "CrossPointState.h"
 #include "fontIds.h"
@@ -42,16 +40,16 @@ void SleepActivity::onEnter() {
 }
 
 void SleepActivity::renderPopup(const char* message) const {
-  const int textWidth = renderer.getTextWidth(UI_12_FONT_ID, message);
+  const int textWidth = renderer.getTextWidth(UI_12_FONT_ID, message, EpdFontFamily::BOLD);
   constexpr int margin = 20;
   const int x = (renderer.getScreenWidth() - textWidth - margin * 2) / 2;
   constexpr int y = 117;
   const int w = textWidth + margin * 2;
   const int h = renderer.getLineHeight(UI_12_FONT_ID) + margin * 2;
   // renderer.clearScreen();
+  renderer.fillRect(x - 5, y - 5, w + 10, h + 10, true);
   renderer.fillRect(x + 5, y + 5, w - 10, h - 10, false);
-  renderer.drawText(UI_12_FONT_ID, x + margin, y + margin, message);
-  renderer.drawRect(x + 5, y + 5, w - 10, h - 10);
+  renderer.drawText(UI_12_FONT_ID, x + margin, y + margin, message, true, EpdFontFamily::BOLD);
   renderer.displayBuffer();
 }
 

src/activities/network/CrossPointWebServerActivity.h

@@ -70,4 +70,5 @@ class CrossPointWebServerActivity final : public ActivityWithSubactivity {
   void onExit() override;
   void loop() override;
   bool skipLoopDelay() override { return webServer && webServer->isRunning(); }
+  bool preventAutoSleep() override { return webServer && webServer->isRunning(); }
 };

src/activities/network/WifiSelectionActivity.cpp

@@ -447,7 +447,16 @@ std::string WifiSelectionActivity::getSignalStrengthIndicator(const int32_t rssi
 
 void WifiSelectionActivity::displayTaskLoop() {
   while (true) {
+    // If a subactivity is active, yield CPU time but don't render
     if (subActivity) {
+      vTaskDelay(10 / portTICK_PERIOD_MS);
+      continue;
+    }
+
+    // Don't render if we're in PASSWORD_ENTRY state - we're just transitioning
+    // from the keyboard subactivity back to the main activity
+    if (state == WifiSelectionState::PASSWORD_ENTRY) {
+      vTaskDelay(10 / portTICK_PERIOD_MS);
       continue;
     }
 

src/activities/reader/EpubReaderActivity.cpp

@@ -267,7 +267,8 @@ void EpubReaderActivity::renderScreen() {
     const uint16_t viewportHeight = renderer.getScreenHeight() - orientedMarginTop - orientedMarginBottom;
 
     if (!section->loadSectionFile(SETTINGS.getReaderFontId(), SETTINGS.getReaderLineCompression(),
-                                  SETTINGS.extraParagraphSpacing, viewportWidth, viewportHeight)) {
+                                  SETTINGS.extraParagraphSpacing, SETTINGS.paragraphAlignment, viewportWidth,
+                                  viewportHeight)) {
       Serial.printf("[%lu] [ERS] Cache not found, building...\n", millis());
 
       // Progress bar dimensions
@@ -311,8 +312,8 @@ void EpubReaderActivity::renderScreen() {
       };
 
       if (!section->createSectionFile(SETTINGS.getReaderFontId(), SETTINGS.getReaderLineCompression(),
-                                      SETTINGS.extraParagraphSpacing, viewportWidth, viewportHeight, progressSetup,
-                                      progressCallback)) {
+                                      SETTINGS.extraParagraphSpacing, SETTINGS.paragraphAlignment, viewportWidth,
+                                      viewportHeight, progressSetup, progressCallback)) {
         Serial.printf("[%lu] [ERS] Failed to persist page data to SD\n", millis());
         section.reset();
         return;

src/activities/settings/OtaUpdateActivity.h

@@ -41,4 +41,5 @@ class OtaUpdateActivity : public ActivityWithSubactivity {
   void onEnter() override;
   void onExit() override;
   void loop() override;
+  bool preventAutoSleep() override { return state == CHECKING_FOR_UPDATE || state == UPDATE_IN_PROGRESS; }
 };

src/activities/settings/SettingsActivity.cpp

@@ -9,7 +9,7 @@
 
 // Define the static settings list
 namespace {
-constexpr int settingsCount = 11;
+constexpr int settingsCount = 12;
 const SettingInfo settingsList[settingsCount] = {
     // Should match with SLEEP_SCREEN_MODE
     {"Sleep Screen", SettingType::ENUM, &CrossPointSettings::sleepScreen, {"Dark", "Light", "Custom", "Cover"}},
@@ -34,6 +34,10 @@ const SettingInfo settingsList[settingsCount] = {
      {"Bookerly", "Noto Sans", "Open Dyslexic"}},
     {"Reader Font Size", SettingType::ENUM, &CrossPointSettings::fontSize, {"Small", "Medium", "Large", "X Large"}},
     {"Reader Line Spacing", SettingType::ENUM, &CrossPointSettings::lineSpacing, {"Tight", "Normal", "Wide"}},
+    {"Reader Paragraph Alignment",
+     SettingType::ENUM,
+     &CrossPointSettings::paragraphAlignment,
+     {"Justify", "Left", "Center", "Right"}},
     {"Check for updates", SettingType::ACTION, nullptr, {}},
 };
 }  // namespace

src/main.cpp

@@ -316,9 +316,10 @@ void loop() {
     lastMemPrint = millis();
   }
 
-  // Check for any user activity (button press or release)
+  // Check for any user activity (button press or release) or active background work
   static unsigned long lastActivityTime = millis();
-  if (inputManager.wasAnyPressed() || inputManager.wasAnyReleased()) {
+  if (inputManager.wasAnyPressed() || inputManager.wasAnyReleased() ||
+      (currentActivity && currentActivity->preventAutoSleep())) {
     lastActivityTime = millis();  // Reset inactivity timer
   }
 

src/network/html/FilesPage.html

@@ -341,6 +341,90 @@
       width: 60px;
       text-align: center;
     }
+    /* Failed uploads banner */
+    .failed-uploads-banner {
+      background-color: #fff3cd;
+      border: 1px solid #ffc107;
+      border-radius: 4px;
+      padding: 15px;
+      margin-bottom: 15px;
+      display: none;
+    }
+    .failed-uploads-banner.show {
+      display: block;
+    }
+    .failed-uploads-header {
+      display: flex;
+      justify-content: space-between;
+      align-items: center;
+      margin-bottom: 10px;
+    }
+    .failed-uploads-title {
+      font-weight: 600;
+      color: #856404;
+      margin: 0;
+    }
+    .dismiss-btn {
+      background: none;
+      border: none;
+      font-size: 1.2em;
+      cursor: pointer;
+      color: #856404;
+      padding: 0;
+      line-height: 1;
+    }
+    .dismiss-btn:hover {
+      color: #533f03;
+    }
+    .failed-file-item {
+      display: flex;
+      justify-content: space-between;
+      align-items: center;
+      padding: 8px 0;
+      border-bottom: 1px solid #ffe69c;
+    }
+    .failed-file-item:last-child {
+      border-bottom: none;
+    }
+    .failed-file-info {
+      flex: 1;
+    }
+    .failed-file-name {
+      font-weight: 500;
+      color: #856404;
+    }
+    .failed-file-error {
+      font-size: 0.85em;
+      color: #856404;
+      opacity: 0.8;
+    }
+    .retry-btn {
+      background-color: #ffc107;
+      color: #533f03;
+      border: none;
+      padding: 6px 12px;
+      border-radius: 4px;
+      cursor: pointer;
+      font-size: 0.9em;
+      font-weight: 600;
+    }
+    .retry-btn:hover {
+      background-color: #e0a800;
+    }
+    .retry-all-btn {
+      background-color: #ffc107;
+      color: #533f03;
+      border: none;
+      padding: 8px 16px;
+      border-radius: 4px;
+      cursor: pointer;
+      font-size: 0.95em;
+      font-weight: 600;
+      margin-top: 10px;
+    }
+    .retry-all-btn:hover {
+      background-color: #e0a800;
+    }
     /* Delete modal */
     .delete-warning {
       color: #e74c3c;
@@ -505,6 +589,16 @@
   </div>
 </div>
 
+<!-- Failed Uploads Banner -->
+<div class="failed-uploads-banner" id="failedUploadsBanner">
+  <div class="failed-uploads-header">
+    <h3 class="failed-uploads-title">⚠️ Some files failed to upload</h3>
+    <button class="dismiss-btn" onclick="dismissFailedUploads()" title="Dismiss">&times;</button>
+  </div>
+  <div id="failedFilesList"></div>
+  <button class="retry-all-btn" onclick="retryAllFailedUploads()">Retry All Failed Uploads</button>
+</div>
+
 <div class="card">
   <div class="contents-header">
     <h2 class="contents-title">Contents</h2>
@@ -531,7 +625,7 @@
     <h3>📤 Upload file</h3>
     <div class="upload-form">
       <p class="file-info">Select a file to upload to <strong id="uploadPathDisplay"></strong></p>
-      <input type="file" id="fileInput" onchange="validateFile()">
+      <input type="file" id="fileInput" onchange="validateFile()" multiple>
       <button id="uploadBtn" class="upload-btn" onclick="uploadFile()" disabled>Upload</button>
       <div id="progress-container">
         <div id="progress-bar"><div id="progress-fill"></div></div>
@@ -717,65 +811,183 @@
   function validateFile() {
     const fileInput = document.getElementById('fileInput');
     const uploadBtn = document.getElementById('uploadBtn');
-    const file = fileInput.files[0];
-    uploadBtn.disabled = !file;
+    const files = fileInput.files;
+    uploadBtn.disabled = !(files.length > 0);
   }
 
-  function uploadFile() {
-    const fileInput = document.getElementById('fileInput');
-    const file = fileInput.files[0];
+let failedUploadsGlobal = [];
 
-    if (!file) {
-      alert('Please select a file first!');
+function uploadFile() {
+  const fileInput = document.getElementById('fileInput');
+  const files = Array.from(fileInput.files);
+
+  if (files.length === 0) {
+    alert('Please select at least one file!');
+    return;
+  }
+
+  const progressContainer = document.getElementById('progress-container');
+  const progressFill = document.getElementById('progress-fill');
+  const progressText = document.getElementById('progress-text');
+  const uploadBtn = document.getElementById('uploadBtn');
+
+  progressContainer.style.display = 'block';
+  uploadBtn.disabled = true;
+
+  let currentIndex = 0;
+  const failedFiles = [];
+
+  function uploadNextFile() {
+    if (currentIndex >= files.length) {
+      // All files processed - show summary
+      if (failedFiles.length === 0) {
+        progressFill.style.backgroundColor = '#4caf50';
+        progressText.textContent = 'All uploads complete!';
+        setTimeout(() => {
+          closeUploadModal();
+          hydrate(); // Refresh file list instead of reloading
+        }, 1000);
+      } else {
+        progressFill.style.backgroundColor = '#e74c3c';
+        const failedList = failedFiles.map(f => f.name).join(', ');
+        progressText.textContent = `${files.length - failedFiles.length}/${files.length} uploaded. Failed: ${failedList}`;
+        
+        // Store failed files globally and show banner
+        failedUploadsGlobal = failedFiles;
+        
+        setTimeout(() => {
+          closeUploadModal();
+          showFailedUploadsBanner();
+          hydrate(); // Refresh file list to show successfully uploaded files
+        }, 2000);
+      }
       return;
     }
 
+    const file = files[currentIndex];
     const formData = new FormData();
     formData.append('file', file);
 
-    const progressContainer = document.getElementById('progress-container');
-    const progressFill = document.getElementById('progress-fill');
-    const progressText = document.getElementById('progress-text');
-    const uploadBtn = document.getElementById('uploadBtn');
-
-    progressContainer.style.display = 'block';
-    uploadBtn.disabled = true;
-
     const xhr = new XMLHttpRequest();
     // Include path as query parameter since multipart form data doesn't make
     // form fields available until after file upload completes
     xhr.open('POST', '/upload?path=' + encodeURIComponent(currentPath), true);
 
-    xhr.upload.onprogress = function(e) {
+    progressFill.style.width = '0%';
+    progressFill.style.backgroundColor = '#4caf50';
+    progressText.textContent = `Uploading ${file.name} (${currentIndex + 1}/${files.length})`;
+
+    xhr.upload.onprogress = function (e) {
       if (e.lengthComputable) {
         const percent = Math.round((e.loaded / e.total) * 100);
         progressFill.style.width = percent + '%';
-        progressText.textContent = 'Uploading: ' + percent + '%';
+        progressText.textContent =
+          `Uploading ${file.name} (${currentIndex + 1}/${files.length}) — ${percent}%`;
       }
     };
 
-    xhr.onload = function() {
+    xhr.onload = function () {
       if (xhr.status === 200) {
-        progressText.textContent = 'Upload complete!';
-        setTimeout(function() {
-          window.location.reload();
-        }, 1000);
+        currentIndex++;
+        uploadNextFile(); // upload next file
       } else {
-        progressText.textContent = 'Upload failed: ' + xhr.responseText;
-        progressFill.style.backgroundColor = '#e74c3c';
-        uploadBtn.disabled = false;
+        // Track failure and continue with next file
+        failedFiles.push({ name: file.name, error: xhr.responseText, file: file });
+        currentIndex++;
+        uploadNextFile();
       }
     };
 
-    xhr.onerror = function() {
-      progressText.textContent = 'Upload failed - network error';
-      progressFill.style.backgroundColor = '#e74c3c';
-      uploadBtn.disabled = false;
+    xhr.onerror = function () {
+      // Track network error and continue with next file
+      failedFiles.push({ name: file.name, error: 'network error', file: file });
+      currentIndex++;
+      uploadNextFile();
     };
 
     xhr.send(formData);
   }
 
+  uploadNextFile();
+}
+
+function showFailedUploadsBanner() {
+  const banner = document.getElementById('failedUploadsBanner');
+  const filesList = document.getElementById('failedFilesList');
+  
+  filesList.innerHTML = '';
+  
+  failedUploadsGlobal.forEach((failedFile, index) => {
+    const item = document.createElement('div');
+    item.className = 'failed-file-item';
+    item.innerHTML = `
+      <div class="failed-file-info">
+        <div class="failed-file-name">📄 ${escapeHtml(failedFile.name)}</div>
+        <div class="failed-file-error">Error: ${escapeHtml(failedFile.error)}</div>
+      </div>
+      <button class="retry-btn" onclick="retrySingleUpload(${index})">Retry</button>
+    `;
+    filesList.appendChild(item);
+  });
+  
+  // Ensure retry all button is visible
+  const retryAllBtn = banner.querySelector('.retry-all-btn');
+  if (retryAllBtn) retryAllBtn.style.display = '';
+  
+  banner.classList.add('show');
+}
+
+function dismissFailedUploads() {
+  const banner = document.getElementById('failedUploadsBanner');
+  banner.classList.remove('show');
+  failedUploadsGlobal = [];
+}
+
+function retrySingleUpload(index) {
+  const failedFile = failedUploadsGlobal[index];
+  if (!failedFile) return;
+  
+  // Create a DataTransfer to set the file input
+  const dt = new DataTransfer();
+  dt.items.add(failedFile.file);
+  
+  const fileInput = document.getElementById('fileInput');
+  fileInput.files = dt.files;
+  
+  // Remove this file from failed list
+  failedUploadsGlobal.splice(index, 1);
+  
+  // If no more failed files, hide banner
+  if (failedUploadsGlobal.length === 0) {
+    dismissFailedUploads();
+  }
+  
+  // Open modal and trigger upload
+  openUploadModal();
+  validateFile();
+}
+
+function retryAllFailedUploads() {
+  if (failedUploadsGlobal.length === 0) return;
+  
+  // Create a DataTransfer with all failed files
+  const dt = new DataTransfer();
+  failedUploadsGlobal.forEach(failedFile => {
+    dt.items.add(failedFile.file);
+  });
+  
+  const fileInput = document.getElementById('fileInput');
+  fileInput.files = dt.files;
+  
+  // Clear failed files list
+  failedUploadsGlobal = [];
+  dismissFailedUploads();
+  
+  // Open modal and trigger upload
+  openUploadModal();
+  validateFile();
+}
+
   function createFolder() {
     const folderName = document.getElementById('folderName').value.trim();