diff --git a/docs/v5.0.0/RELEASE_NOTES_v5.0.0.md b/docs/v5.0.0/RELEASE_NOTES_v5.0.0.md
index 3719bd0a..a4c909ab 100644
--- a/docs/v5.0.0/RELEASE_NOTES_v5.0.0.md
+++ b/docs/v5.0.0/RELEASE_NOTES_v5.0.0.md
@@ -24,6 +24,7 @@ Version 5.0.0 is a major release featuring .NET 10.0 framework upgrade, modern d
 - Improved visual hierarchy and card-based design
 
 ### SQLite Database Support
+- **Optional upgrade** - SQLite available for enhanced performance (not default)
 - **Enhanced performance** with faster data access and queries
 - **Better scalability** for larger configurations
 - **Improved reliability** with transactional support and data integrity
@@ -31,7 +32,8 @@ Version 5.0.0 is a major release featuring .NET 10.0 framework upgrade, modern d
 - **One-click migration** with automatic backup creation
 - **Rollback support** if migration issues occur
 - Admin UI for easy storage provider management
-- Maintains backward compatibility with file-based JSON storage
+- **Default remains JSON file-based storage** for maximum compatibility
+- ⚠️ **IMPORTANT**: SQLite not recommended for Azure Container Apps with File Share mounts (use FileSystem storage instead)
 
 ### Azure Tenant Name Validation
 - **Validate generated names against your Azure tenant** before deployment
diff --git a/docs/v5.0.0/V5.0.0_MIGRATION_GUIDE.md b/docs/v5.0.0/V5.0.0_MIGRATION_GUIDE.md
index e9594ca0..d27e3c69 100644
--- a/docs/v5.0.0/V5.0.0_MIGRATION_GUIDE.md
+++ b/docs/v5.0.0/V5.0.0_MIGRATION_GUIDE.md
@@ -1,5 +1,3 @@
-# Azure Naming Tool v5.0.0 Migration Guide
-
 ## Overview
 
 Version 5.0.0 of the Azure Naming Tool introduces significant enhancements including a modern redesigned UI, SQLite database storage option, and Azure resource name validation capabilities. This guide will help you successfully migrate from previous versions to v5.0.0.
@@ -279,7 +277,23 @@ v5.0.0 requires .NET 10.0 runtime. You **MUST** update your App Service runtime
 
 **⚠️ IMPORTANT: .NET 10.0 Docker Image Required**
 
-v5.0.0 uses a new Docker image based on .NET 10.0 runtime.
+v5.0.0 uses a new Docker image based on .NET 10.0 runtime. You need to build the image locally from source.
+
+**🚨 CRITICAL - Azure Container Apps Users:**
+
+If you are deploying to **Azure Container Apps with Azure File Share** for persistent storage:
+
+> **DO NOT use SQLite storage!** 
+> 
+> SQLite does not work with Azure File Share (SMB/CIFS network mounts) due to file locking issues. Your container will fail to start with `"database is locked"` errors.
+> 
+> **Solution:** Use FileSystem (JSON) storage instead:
+> - In `appsettings.json`, ensure: `"StorageProvider": "FileSystem"`
+> - This is the default for fresh Docker installations
+> - JSON files work perfectly with Azure File Share mounts
+> - You can still use all v5.0.0 features except Azure Tenant Name Validation (which requires SQLite)
+
+**For other Docker deployments:** SQLite works fine with local Docker volumes.
 
 1. **STOP the current container (if running):**
    ```bash
@@ -287,12 +301,18 @@ v5.0.0 uses a new Docker image based on .NET 10.0 runtime.
    docker rm azurenamingtool
    ```
 
-2. **Pull the latest v5.0.0 image:**
+2. **Clone the repository and build the v5.0.0 image:**
    ```bash
-   # Pull the .NET 10.0-based image
-   docker pull ghcr.io/mspnp/azurenamingtool:v5.0.0
-   # Or use latest tag (ensure it's v5.0.0 or higher)
-   docker pull ghcr.io/mspnp/azurenamingtool:latest
+   # Clone the repository (if not already cloned)
+   git clone https://github.com/mspnp/AzureNamingTool.git
+   cd AzureNamingTool
+   
+   # Checkout the v5.0.0 release tag
+   git checkout v5.0.0
+   
+   # Build the Docker image from the src directory
+   cd src
+   docker build -t azurenamingtool:v5.0.0 .
    ```
 
 3. **Run with persistent storage:**
@@ -303,7 +323,7 @@ v5.0.0 uses a new Docker image based on .NET 10.0 runtime.
      -v $(pwd)/settings:/app/settings \
      --name azurenamingtool \
      --restart unless-stopped \
-     ghcr.io/mspnp/azurenamingtool:v5.0.0
+     azurenamingtool:v5.0.0
    ```
 
    **Windows PowerShell:**
@@ -314,10 +334,10 @@ v5.0.0 uses a new Docker image based on .NET 10.0 runtime.
      -v ${PWD}/settings:/app/settings `
      --name azurenamingtool `
      --restart unless-stopped `
-     ghcr.io/mspnp/azurenamingtool:v5.0.0
+     azurenamingtool:v5.0.0
    ```
 
-4. **Verify container started:**
+5. **Verify container started:**
    ```bash
    # Check container is running
    docker ps
@@ -328,11 +348,11 @@ v5.0.0 uses a new Docker image based on .NET 10.0 runtime.
    # Should see: "Now listening on: http://[::]:80"
    ```
 
-5. Wait 30-60 seconds, then access the application at `http://localhost`
+6. Access the application at `http://localhost:8081` (or your chosen port)
 
-6. **VERIFY DEPLOYMENT:**
-   - Check container logs: `docker logs azurenamingtool | grep "Application started"`
-   - Access http://localhost and verify v5.0.0 loads
+7. **VERIFY DEPLOYMENT:**
+   - Check container logs: `docker logs azurenamingtool`
+   - Access http://localhost:8081 and verify v5.0.0 loads
    - Check footer for version "5.0.0"
 
 **Docker Compose Example:**
@@ -340,13 +360,13 @@ v5.0.0 uses a new Docker image based on .NET 10.0 runtime.
 version: '3.8'
 services:
   azurenamingtool:
-    image: ghcr.io/mspnp/azurenamingtool:v5.0.0
+    build: .  # Build from local Dockerfile
+    image: azurenamingtool:latest
     container_name: azurenamingtool
     ports:
-      - "80:80"
+      - "8081:80"  # Map host port 8081 to container port 80
     volumes:
-      - ./repository:/app/repository
-      - ./settings:/app/settings
+      - azurenamingtoolvol:/app/settings  # Use Docker volume for persistence
     restart: unless-stopped
     environment:
       - ASPNETCORE_ENVIRONMENT=Production
@@ -574,6 +594,25 @@ v5.0.0 introduces SQLite database support for improved performance and reliabili
 > - The application **MUST BE RESTARTED** after migration completes
 > - Ensure you have adequate disk space (at least 2x your current data size)
 
+> **🚨 CRITICAL - Azure Container Apps & File Share Users:**
+> 
+> **DO NOT migrate to SQLite if you are using:**
+> - **Azure Container Apps with Azure File Share** mounted volumes
+> - **Any network file system** (SMB/CIFS/NFS) for persistent storage
+> - **Docker with bind mounts to network drives**
+> 
+> **Why:** SQLite does not support network file systems due to file locking limitations. The database file will become locked and your container will fail to start with error: `"database is locked"`.
+> 
+> **Solution:** Keep using **FileSystem (JSON)** storage provider for these scenarios. JSON file storage works perfectly with network mounts.
+> 
+> **When SQLite works:**
+> - ✅ Azure App Service (local disk)
+> - ✅ Docker with Docker volumes (local)
+> - ✅ Standalone installations (local disk)
+> - ✅ Kubernetes with local persistent volumes
+> - ❌ Azure Container Apps with File Share
+> - ❌ Any network-based storage
+
 #### Prerequisites
 
 1. **Complete Steps 1-5** (Deploy v5.0.0 and restore configuration)
@@ -746,6 +785,44 @@ If you need to rollback from SQLite to file-based storage:
 4. Try rollback procedure (see Step 6)
 5. Restore from pre-migration backup
 
+#### Container Fails with "Database is Locked" Error
+**Symptom:** Docker container or Azure Container App fails to start with SQLite error: `"SQLite Error 5: 'database is locked'"` or `"Microsoft.Data.Sqlite.SqliteException (0x80004005)"`
+
+**Root Cause:** SQLite does not support network file systems (Azure File Share uses SMB/CIFS protocol). File locking doesn't work correctly over network mounts.
+
+**Solution:**
+1. **Immediate Fix - Switch to FileSystem Storage:**
+   ```bash
+   # Stop the container
+   docker stop azurenamingtool
+   docker rm azurenamingtool
+   
+   # Edit settings/appsettings.json and change:
+   "StorageProvider": "FileSystem"  # Change from "SQLite"
+   
+   # Delete the SQLite database file (optional, but recommended)
+   rm settings/azurenamingtool.db
+   
+   # Restart container
+   docker run -d \
+     -p 8081:80 \
+     --mount source=azurenamingtoolvol,target=/app/settings \
+     --name azurenamingtool \
+     azurenamingtool:latest
+   ```
+
+2. **For Azure Container Apps:**
+   - Keep using FileSystem (JSON) storage
+   - Do NOT migrate to SQLite
+   - JSON files work perfectly with Azure File Share
+
+3. **Long-term Solution:**
+   - Use FileSystem storage for Azure Container Apps with File Share
+   - OR migrate to Azure App Service with local disk for SQLite support
+   - OR use Azure SQL Database (future enhancement)
+
+**Prevention:** Always check deployment platform before migrating to SQLite (see warning in Step 6).
+
 #### Azure Validation Not Working
 **Symptom:** Azure validation features are not available
 
diff --git a/docs/v5.0.0/wiki/V5.0.0_MIGRATION_GUIDE.md b/docs/v5.0.0/wiki/V5.0.0_MIGRATION_GUIDE.md
index b4b3ce9a..dc1e72a6 100644
--- a/docs/v5.0.0/wiki/V5.0.0_MIGRATION_GUIDE.md
+++ b/docs/v5.0.0/wiki/V5.0.0_MIGRATION_GUIDE.md
@@ -279,7 +279,7 @@ v5.0.0 requires .NET 10.0 runtime. You **MUST** update your App Service runtime
 
 **⚠️ IMPORTANT: .NET 10.0 Docker Image Required**
 
-v5.0.0 uses a new Docker image based on .NET 10.0 runtime.
+v5.0.0 uses a new Docker image based on .NET 10.0 runtime. You must build the image from source.
 
 1. **STOP the current container (if running):**
    ```bash
@@ -287,37 +287,44 @@ v5.0.0 uses a new Docker image based on .NET 10.0 runtime.
    docker rm azurenamingtool
    ```
 
-2. **Pull the latest v5.0.0 image:**
+2. **Download and extract v5.0.0 release:**
+   - Navigate to the [Releases page](https://github.com/mspnp/AzureNamingTool/releases)
+   - Download **AzureNamingTool.zip** from the v5.0.0 release assets
+   - Extract the ZIP file to a folder
+   - Verify the extracted files match the repository contents
+
+3. **Build the v5.0.0 Docker image:**
    ```bash
-   # Pull the .NET 10.0-based image
-   docker pull ghcr.io/mspnp/azurenamingtool:v5.0.0
-   # Or use latest tag (ensure it's v5.0.0 or higher)
-   docker pull ghcr.io/mspnp/azurenamingtool:latest
+   # Navigate to the extracted folder
+   cd path/to/extracted/AzureNamingTool
+   
+   # Build the Docker image
+   docker build -t azurenamingtool .
    ```
+   
+   > **NOTE:** Ensure the '.' is included in the command
 
-3. **Run with persistent storage:**
+4. **Run with persistent storage using a Docker volume:**
    ```bash
    docker run -d \
-     -p 80:80 \
-     -v $(pwd)/repository:/app/repository \
-     -v $(pwd)/settings:/app/settings \
+     -p 8081:80 \
+     --mount source=azurenamingtoolvol,target=/app/settings \
      --name azurenamingtool \
      --restart unless-stopped \
-     ghcr.io/mspnp/azurenamingtool:v5.0.0
+     azurenamingtool:latest
    ```
 
-   **Windows PowerShell:**
-   ```powershell
-   docker run -d `
-     -p 80:80 `
-     -v ${PWD}/repository:/app/repository `
-     -v ${PWD}/settings:/app/settings `
-     --name azurenamingtool `
-     --restart unless-stopped `
-     ghcr.io/mspnp/azurenamingtool:v5.0.0
+   **Windows Command Prompt:**
+   ```cmd
+   docker run -d -p 8081:80 --mount source=azurenamingtoolvol,target=/app/settings --name azurenamingtool --restart unless-stopped azurenamingtool:latest
    ```
+   
+   > **NOTES:**
+   > - Substitute 8081 for any port not in use on your machine
+   > - The volume mount ensures settings persist across container restarts
+   > - You may see warnings about DataProtection keys - these are normal and indicate keys are local to the container
 
-4. **Verify container started:**
+5. **Verify container started:**
    ```bash
    # Check container is running
    docker ps
@@ -328,11 +335,11 @@ v5.0.0 uses a new Docker image based on .NET 10.0 runtime.
    # Should see: "Now listening on: http://[::]:80"
    ```
 
-5. Wait 30-60 seconds, then access the application at `http://localhost`
+6. Access the application at `http://localhost:8081` (or your chosen port)
 
-6. **VERIFY DEPLOYMENT:**
-   - Check container logs: `docker logs azurenamingtool | grep "Application started"`
-   - Access http://localhost and verify v5.0.0 loads
+7. **VERIFY DEPLOYMENT:**
+   - Check container logs: `docker logs azurenamingtool`
+   - Access http://localhost:8081 and verify v5.0.0 loads
    - Check footer for version "5.0.0"
 
 **Docker Compose Example:**
@@ -340,13 +347,13 @@ v5.0.0 uses a new Docker image based on .NET 10.0 runtime.
 version: '3.8'
 services:
   azurenamingtool:
-    image: ghcr.io/mspnp/azurenamingtool:v5.0.0
+    build: .  # Build from local Dockerfile
+    image: azurenamingtool:latest
     container_name: azurenamingtool
     ports:
-      - "80:80"
+      - "8081:80"  # Map host port 8081 to container port 80
     volumes:
-      - ./repository:/app/repository
-      - ./settings:/app/settings
+      - azurenamingtoolvol:/app/settings  # Use Docker volume for persistence
     restart: unless-stopped
     environment:
       - ASPNETCORE_ENVIRONMENT=Production
diff --git a/src/Components/Modals/MigrationPromptModal.razor b/src/Components/Modals/MigrationPromptModal.razor
index 8f290a1f..2155978c 100644
--- a/src/Components/Modals/MigrationPromptModal.razor
+++ b/src/Components/Modals/MigrationPromptModal.razor
@@ -41,6 +41,20 @@
         </div>
     </div>
 
+    <div class="modern-notification-danger" style="margin-bottom: 1rem;">
+        <i class="bi bi-exclamation-triangle-fill"></i>
+        <div>
+            <strong>⚠️ CRITICAL - Azure Container Apps Users:</strong>
+            <p style="margin: 0.5rem 0 0 0;">
+                <strong>DO NOT migrate to SQLite</strong> if you are using <strong>Azure Container Apps with Azure File Share</strong> for persistent storage.
+                SQLite does not work with network file systems (Azure File Share uses SMB/CIFS) and will cause "database is locked" errors.
+            </p>
+            <p style="margin: 0.5rem 0 0 0;">
+                <strong>Keep using JSON (FileSystem)</strong> storage for Azure Container Apps deployments with File Share.
+            </p>
+        </div>
+    </div>
+
     @if (showMigrationStatus)
     {
         <div class="modern-notification-warning">
diff --git a/src/Program.cs b/src/Program.cs
index c6370e2d..bcaf0773 100644
--- a/src/Program.cs
+++ b/src/Program.cs
@@ -290,17 +290,17 @@
 else
 {
     // No settings/appsettings.json = Fresh install
-    // VerifyConfiguration will copy repository/appsettings.json with StorageProvider=SQLite
-    Console.WriteLine("[Storage] Fresh install detected - will use default (SQLite)");
+    // VerifyConfiguration will copy repository/appsettings.json with StorageProvider=FileSystem (default)
+    Console.WriteLine("[Storage] Fresh install detected - will use default (FileSystem)");
 }
 
 // Run VerifyConfiguration to ensure all config files exist
-// For fresh installs, this copies repository/appsettings.json → settings/appsettings.json (with StorageProvider=SQLite)
+// For fresh installs, this copies repository/appsettings.json → settings/appsettings.json (with StorageProvider=FileSystem)
 ConfigurationHelper.VerifyConfiguration(new StateContainer());
 
 // Read the configuration and use the StorageProvider value
 var siteConfig = ConfigurationHelper.GetConfigurationData();
-var provider = siteConfig.StorageProvider?.ToLower() ?? "sqlite";
+var provider = siteConfig.StorageProvider?.ToLower() ?? "filesystem";
 
 if (provider == "sqlite")
 {
diff --git a/src/repository/appsettings.json b/src/repository/appsettings.json
index aaa780df..633d7f7a 100644
--- a/src/repository/appsettings.json
+++ b/src/repository/appsettings.json
@@ -24,5 +24,5 @@
   "GeneratedNamesLogEnabled": "True",
   "InstructionsEnabled": "True",
   "IdentityHeaderName": "X-MS-CLIENT-PRINCIPAL-NAME",
-  "StorageProvider": "SQLite"
+  "StorageProvider": "FileSystem"
 }
\ No newline at end of file