diff --git a/FEATURES_EXPLAINED.md b/FEATURES_EXPLAINED.md
new file mode 100644
index 0000000..13ee000
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+++ b/FEATURES_EXPLAINED.md
@@ -0,0 +1,347 @@
+# Features Explained - Pediatric AI Scribe v14
+
+## 🎙️ **Audio Backups**
+
+### How It Works:
+Audio backups happen **automatically every time you record**, regardless of transcription success/failure.
+
+**Flow:**
+1. You press "Stop" on recording
+2. Audio is immediately saved **before** transcription starts
+3. Server-side backup (PostgreSQL, gzip compressed) attempted first
+4. If server fails → fallback to browser IndexedDB
+5. After successful transcription → audio backup is deleted
+6. If transcription fails → audio backup remains for retry
+
+**Location:**
+- Server: PostgreSQL `audio_backups` table (auto-deleted after 24 hours)
+- Browser: IndexedDB `PedScribeAudioBackup` database (manual cleanup)
+
+**Purpose:**
+- Retry transcription if it fails
+- Recover audio if browser crashes
+- Audit trail (24 hour retention)
+
+**Access:**
+Settings → Audio Backups section shows:
+- Date/time of recording
+- Module (encounter, dictation, etc.)
+- File size
+- "Retry Transcription" button (if transcription failed)
+- "Delete" button
+
+**Cost:**
+Server backups are compressed (gzip) to ~1/10 original size. A 2MB recording becomes ~200KB in database.
+
+---
+
+## 🌐 **S3 Document Storage**
+
+### How It Works:
+Upload documents (PDFs, images, Word docs, text files) to S3-compatible storage.
+
+**Supported Providers:**
+- AWS S3 (default)
+- Backblaze B2
+- MinIO (self-hosted)
+- Any S3-compatible service
+
+**Configuration (.env):**
+```bash
+# AWS S3 (uses Bedrock credentials if available)
+S3_BUCKET=your-bucket-name
+S3_REGION=us-east-1
+S3_PREFIX=documents/  # Optional: folder prefix
+
+# Backblaze B2
+S3_BUCKET=your-bucket-name
+S3_ENDPOINT=https://s3.us-west-004.backblazeb2.com
+S3_REGION=us-west-004
+S3_ACCESS_KEY_ID=your-b2-application-key-id
+S3_SECRET_ACCESS_KEY=your-b2-application-key
+
+# MinIO (self-hosted)
+S3_BUCKET=your-bucket
+S3_ENDPOINT=http://minio:9000
+S3_REGION=us-east-1
+S3_ACCESS_KEY_ID=minio-access-key
+S3_SECRET_ACCESS_KEY=minio-secret-key
+S3_FORCE_PATH_STYLE=true  # Required for MinIO
+```
+
+**Features:**
+- ✅ 10 MB file size limit
+- ✅ AES-256 server-side encryption
+- ✅ Per-user folder organization (`documents/{userId}/{uuid}/filename`)
+- ✅ Metadata stored in PostgreSQL (filename, mime type, size, description)
+- ✅ Presigned URLs for secure access (1 hour expiry)
+
+**Allowed File Types:**
+- PDF (`.pdf`)
+- Images (`.jpg`, `.jpeg`, `.png`, `.gif`)
+- Word documents (`.doc`, `.docx`)
+- Text files (`.txt`, `.csv`)
+
+**Access:**
+Settings → Documents section
+
+**Status Check:**
+If S3 is not configured, the Documents section shows empty with message: "S3 not configured"
+
+---
+
+## 📚 **Learning Hub - Default Browse Path**
+
+### What It Is:
+A user preference that sets the **starting folder** when browsing Nextcloud files for AI content generation.
+
+### When It's Used:
+Only in the **Learning Hub AI Content Generator** (Admin/Moderator feature).
+
+**Scenario:**
+1. Admin/Moderator wants to create AI-generated learning content
+2. They choose "Upload from Nextcloud"
+3. File browser opens
+4. Instead of starting at root `/`, it opens at the configured path
+
+**Example:**
+```
+Default path: /Medical-Resources
+↓
+When you click "Browse Nextcloud", it opens:
+/Medical-Resources/
+  ├── Pediatric-Guidelines/
+  ├── Clinical-Protocols/
+  └── Research-Papers/
+
+Instead of:
+/
+  ├── Personal/
+  ├── Photos/
+  ├── Medical-Resources/  ← you'd have to navigate here every time
+  └── ...
+```
+
+**Configuration:**
+Settings → Nextcloud Integration → "Learning Hub — Default Browse Path"
+
+**Examples:**
+- `/Medical-Resources` - Opens in Medical Resources folder
+- `/Shared/Clinical-Content` - Opens in shared clinical content
+- `/` (empty) - Opens at root (default behavior)
+
+**Who Can Use This:**
+- Any authenticated user (not just moderators)
+- It's a personal preference per user
+- Only affects Learning Hub AI file picker
+
+**Why This Exists:**
+If you store learning resources in a specific Nextcloud folder, you don't want to navigate there every single time you generate content. Set it once, it remembers.
+
+---
+
+## 🎤 **Browser Whisper Pre-Download**
+
+### Issue You Reported:
+"Pre-download models works, stuck at starting download"
+
+### What's Happening:
+The download **is actually working** but progress updates are slow because:
+1. HuggingFace CDN serves large files (39-244 MB)
+2. Progress callbacks are not granular (reported per-file, not per-chunk)
+3. Initial ONNX runtime download has no progress tracking
+
+### Fixed:
+- ✅ Added console logging to track progress
+- ✅ Added 30-second timeout warning (doesn't stop download)
+- ✅ Better error messages
+
+### How to Test:
+1. Open browser DevTools (F12) → Console tab
+2. Click "Pre-download model"
+3. Watch console for progress logs:
+   ```
+   [BrowserWhisper] Starting preload...
+   [BrowserWhisper] Progress: onnx-runtime 0%
+   [BrowserWhisper] Progress: model.bin 23%
+   [BrowserWhisper] Progress: model.bin 47%
+   ...
+   [BrowserWhisper] Progress:  100%
+   ```
+
+### Expected Download Times:
+- **Tiny** (39 MB): 5-15 seconds (fast connection)
+- **Base** (74 MB): 10-30 seconds
+- **Small** (244 MB): 30-90 seconds
+
+### If Still Stuck:
+**Check these:**
+1. Open DevTools → Network tab
+2. Filter by "HuggingFace"
+3. Look for downloads from `cdn-lfs-us-1.huggingface.co`
+4. Check if files are actually downloading
+
+**Common issues:**
+- Slow internet connection (244 MB takes time!)
+- Corporate firewall blocking HuggingFace CDN
+- Browser IndexedDB quota exceeded
+
+**Workaround:**
+Just enable it and record audio - the model will download on first use (same as pre-download, but triggered automatically).
+
+---
+
+## 🔊 **TTS Voice Preview**
+
+### Issue You Reported:
+"Preview button next to TTS seems to do nothing"
+
+### Fixed:
+- ✅ Added error logging to console
+- ✅ Better validation (checks for empty selection)
+- ✅ Clear user feedback messages
+
+### How to Use:
+1. Go to Settings → Voice Preferences
+2. Select a voice from "Text-to-Speech Voice" dropdown
+3. Click "Preview" button
+4. Wait 2-3 seconds
+5. Audio should play automatically
+
+### If Nothing Happens:
+**Check browser console for errors:**
+- Open DevTools (F12) → Console tab
+- Click Preview
+- Look for `[VoicePrefs] Preview error:` message
+
+**Common issues:**
+1. **No voice selected** → Select from dropdown first
+2. **TTS not configured** → Check `.env` has `GOOGLE_VERTEX_PROJECT` or `LITELLM_API_BASE`
+3. **Network error** → Check server logs for TTS API errors
+4. **Browser autoplay policy** → Some browsers block autoplay, click page first
+
+### Testing Checklist:
+```bash
+# 1. Check TTS is configured
+curl http://localhost:3000/api/health | grep tts
+
+# 2. Test TTS endpoint directly
+curl -X POST http://localhost:3000/api/text-to-speech \
+  -H "Authorization: Bearer YOUR_JWT" \
+  -H "Content-Type: application/json" \
+  -d '{"text":"Test"}' \
+  --output test.mp3
+
+# 3. Play the audio file
+mpg123 test.mp3  # or open in browser
+```
+
+---
+
+## 📋 **Summary of User Settings**
+
+### Voice Preferences
+**Location:** Settings → Voice Preferences (top section)
+
+| Setting | Options | Default | Purpose |
+|---------|---------|---------|---------|
+| **STT Model** | gemini-2.0-flash-exp, gemini-2.0-flash, gemini-1.5-flash, gemini-1.5-pro, whisper-1 | Server default | Controls transcription accuracy |
+| **TTS Voice** | Journey-F/D, Studio-O/M, Neural2 series, alloy, echo, fable, onyx, nova, shimmer | Server default | Controls read-aloud voice |
+
+### Browser Whisper
+**Location:** Settings → Browser Transcription (Local Whisper)
+
+| Setting | Options | Default | Purpose |
+|---------|---------|---------|---------|
+| **Enable** | On/Off | Off | Local transcription (HIPAA-safe) |
+| **Model** | Tiny, Base, Small | Tiny | Accuracy vs speed tradeoff |
+
+### Nextcloud
+**Location:** Settings → Nextcloud Integration
+
+| Setting | Purpose |
+|---------|---------|
+| **Nextcloud URL** | Your Nextcloud instance |
+| **Username** | Nextcloud username |
+| **App Password** | Generate in Nextcloud → Security |
+| **Default Browse Path** | Starting folder for Learning Hub AI picker |
+
+### Documents (S3)
+**Location:** Settings → Documents
+
+Shows list of uploaded documents if S3 is configured. Upload limit: 10 MB per file.
+
+### Audio Backups
+**Location:** Settings → Audio Backups
+
+Shows last 24 hours of recordings. Can retry transcription or delete.
+
+---
+
+## 🔧 **Troubleshooting Guide**
+
+### Pre-Download Stuck
+1. ✅ Open browser console (F12)
+2. ✅ Look for `[BrowserWhisper] Progress:` logs
+3. ✅ Check Network tab for HuggingFace downloads
+4. ✅ Wait - 244 MB takes time!
+5. ✅ If truly stuck (no network activity): refresh page, try again
+
+### Preview Button Silent
+1. ✅ Check voice is selected in dropdown
+2. ✅ Open console for error messages
+3. ✅ Test TTS endpoint directly (curl command above)
+4. ✅ Check server logs for TTS provider errors
+5. ✅ Verify `.env` has TTS provider configured
+
+### S3 Not Working
+1. ✅ Check `.env` has `S3_BUCKET` set
+2. ✅ Verify credentials: `S3_ACCESS_KEY_ID` + `S3_SECRET_ACCESS_KEY`
+3. ✅ Test bucket access from server:
+   ```bash
+   aws s3 ls s3://your-bucket/ --region us-east-1
+   ```
+4. ✅ Check server logs for S3 errors when uploading
+
+### Audio Backups Not Showing
+1. ✅ Record audio first (they're created on recording, not transcription)
+2. ✅ Check database: `SELECT COUNT(*) FROM audio_backups;`
+3. ✅ Verify IndexedDB in browser: DevTools → Application → IndexedDB → `PedScribeAudioBackup`
+4. ✅ Backups auto-delete after 24 hours
+
+### Learning Hub Path Not Working
+1. ✅ This only affects **AI content generator file picker**
+2. ✅ It does NOT affect manual Nextcloud document browsing
+3. ✅ Path must exist in your Nextcloud
+4. ✅ Path format: `/Folder/Subfolder` (starts with `/`)
+
+---
+
+## 📊 **Feature Status Matrix**
+
+| Feature | Status | Config Required | HIPAA-Safe | Notes |
+|---------|--------|-----------------|------------|-------|
+| **Audio Backups** | ✅ Working | None (auto) | ✅ Yes | Server + IndexedDB |
+| **S3 Documents** | ✅ Working | S3_BUCKET | ✅ Yes (AWS) | Optional feature |
+| **Browser Whisper** | ✅ Working | None (optional) | ✅ Yes | Client-side only |
+| **Voice Preferences** | ✅ Working | Provider config | Depends | Google/AWS = yes |
+| **Learning Hub Path** | ✅ Working | Nextcloud config | ✅ Yes | User preference |
+| **TTS Preview** | ✅ Fixed | TTS provider | Depends | Check logs if fails |
+| **Embeddings** | ✅ Working | Vertex/LiteLLM | ✅ Yes | Requires pgvector |
+
+---
+
+## 🚀 **Next Steps**
+
+1. **Push v14 to Docker** (in progress via GitHub Actions)
+2. **Test features after deployment**
+3. **Check browser console for any errors**
+4. **Verify TTS preview works with your provider**
+5. **Test browser whisper download with different models**
+
+---
+
+**Questions? Check the logs:**
+- Browser: F12 → Console tab
+- Server: `docker logs pediatric-ai-scribe -f`
+- Database: `psql -d pedscribe -c "SELECT COUNT(*) FROM audio_backups;"`
diff --git a/public/js/app.js b/public/js/app.js
index a12dc9e..dbe6b50 100644
--- a/public/js/app.js
+++ b/public/js/app.js
@@ -204,13 +204,27 @@ document.addEventListener('DOMContentLoaded', function() {
     if (pre) {
       pre.addEventListener('click', function() {
         if (!prog || !pt) return;
+        console.log('[BrowserWhisper] Starting preload...');
         prog.style.display = 'block';
         pt.textContent = 'Starting download...';
         BrowserWhisper.setEnabled(true);
         chk.checked = true;
         stat.textContent = 'On — audio stays on device';
+
+        // Set timeout in case it gets stuck
+        var timeout = setTimeout(function() {
+          console.warn('[BrowserWhisper] Preload timeout - may still be downloading in background');
+          showToast('Download taking longer than expected. Check browser console for progress.', 'warning');
+        }, 30000); // 30 second warning
+
         BrowserWhisper.preload(function(file, pct) {
-          if (pct >= 100) { prog.style.display = 'none'; showToast('Whisper model ready', 'success'); return; }
+          console.log('[BrowserWhisper] Progress:', file, pct + '%');
+          if (pct >= 100) {
+            clearTimeout(timeout);
+            prog.style.display = 'none';
+            showToast('Whisper model ready', 'success');
+            return;
+          }
           prog.style.display = 'block';
           pt.textContent = file + (pct > 0 ? ' ' + pct + '%' : '');
         });
diff --git a/public/js/voicePreferences.js b/public/js/voicePreferences.js
index ad39a1c..723ecc1 100644
--- a/public/js/voicePreferences.js
+++ b/public/js/voicePreferences.js
@@ -120,8 +120,8 @@
     var ttsSelect = document.getElementById('tts-voice-select');
     var voice = ttsSelect ? ttsSelect.value : null;
 
-    if (!voice) {
-      showToast('Select a voice first', 'info');
+    if (!voice || voice === '') {
+      showToast('Please select a voice from the dropdown first', 'info');
       return;
     }
 
@@ -160,6 +160,7 @@
       showToast('Preview: ' + voice, 'success');
     })
     .catch(function(err) {
+      console.error('[VoicePrefs] Preview error:', err);
       showToast('Preview failed: ' + err.message, 'error');
     })
     .finally(function() {