diff --git a/README.md b/README.md
index 00d2a18..50d0976 100644
--- a/README.md
+++ b/README.md
@@ -116,39 +116,43 @@ Users can choose their preferred login method on the login page.
 
 ## Production Deployment
 
-For production deployment on Ubuntu with reverse proxy:
+For production deployment on Ubuntu with reverse proxy (multi-domain setup):
 
 1. **Run the automated installation script**:
    ```bash
-   # On your Ubuntu server
+   # On your Ubuntu server (can coexist with other apps)
    wget https://gitlab.com/trbc-dev/pdf-rename-sort/-/raw/main/ubuntu-install.sh
    chmod +x ubuntu-install.sh
    sudo ./ubuntu-install.sh
    ```
 
-2. **Configure environment variables**:
+2. **Configure DNS**:
+   - Point a subdomain (e.g., `pdf-renamer.yourdomain.com`) to your server's IP
+   - This allows the app to run alongside your existing app on port 5000
+
+3. **Configure environment variables**:
    Edit `/etc/systemd/system/pdf-renamer.service` and update:
    - `SECRET_KEY`: Generate a secure random key
    - `TENANT_ID`, `CLIENT_ID`, `CLIENT_SECRET`: From Azure AD app registration
    - `ADMIN_USERNAME` and `ADMIN_PASSWORD`: Set secure credentials
 
-3. **Update domain configuration**:
-   Edit `/etc/nginx/sites-available/pdf-renamer` and replace `your-domain.com` with your actual domain
+4. **Update domain configuration**:
+   Edit `/etc/nginx/sites-available/pdf-renamer` and replace `pdf-renamer.your-domain.com` with your actual subdomain
 
-4. **Enable SSL (recommended)**:
+5. **Enable SSL (recommended)**:
    ```bash
    sudo apt install certbot python3-certbot-nginx
-   sudo certbot --nginx -d your-domain.com
+   sudo certbot --nginx -d your-subdomain.yourdomain.com
    ```
 
-5. **Reload services**:
+6. **Reload services**:
    ```bash
    sudo systemctl daemon-reload
    sudo systemctl restart pdf-renamer
    sudo systemctl reload nginx
    ```
 
-The application will be accessible at your domain on ports 80 (HTTP) and 443 (HTTPS after SSL setup).
+The application will be accessible at your subdomain on ports 80 (HTTP) and 443 (HTTPS after SSL setup), running alongside your existing application.
 
 ## Development
 
diff --git a/ubuntu-install.sh b/ubuntu-install.sh
index fc83ef2..bff6654 100644
--- a/ubuntu-install.sh
+++ b/ubuntu-install.sh
@@ -67,12 +67,12 @@ sudo systemctl daemon-reload
 sudo systemctl enable pdf-renamer
 sudo systemctl start pdf-renamer
 
-# Configure Nginx reverse proxy
-echo "Configuring Nginx reverse proxy..."
+# Configure Nginx reverse proxy for PDF Renamer (multi-domain setup)
+echo "Configuring Nginx reverse proxy for PDF Renamer..."
 sudo tee /etc/nginx/sites-available/pdf-renamer > /dev/null <<EOF
 server {
     listen 80;
-    server_name your-domain.com www.your-domain.com;
+    server_name pdf-renamer.your-domain.com;  # Change this to your actual subdomain
 
     # Handle large file uploads (500MB)
     client_max_body_size 500M;
@@ -91,7 +91,7 @@ server {
         add_header Cache-Control "public, immutable";
     }
 
-    # Proxy to Flask app
+    # Proxy to Flask app on port 3000
     location / {
         proxy_pass http://127.0.0.1:3000;
         proxy_set_header Host \$host;
@@ -104,10 +104,10 @@ server {
         proxy_set_header Upgrade \$http_upgrade;
         proxy_set_header Connection "upgrade";
 
-        # Timeout settings
+        # Timeout settings for large files
         proxy_connect_timeout 60s;
-        proxy_send_timeout 60s;
-        proxy_read_timeout 60s;
+        proxy_send_timeout 300s;  # Increased for large uploads
+        proxy_read_timeout 300s;  # Increased for large uploads
     }
 
     # Gzip compression
@@ -119,11 +119,11 @@ server {
 }
 EOF
 
-# Enable the site
+# Enable the PDF Renamer site (doesn't remove existing sites)
 sudo ln -s /etc/nginx/sites-available/pdf-renamer /etc/nginx/sites-enabled/ 2>/dev/null || true
 
-# Remove default nginx site if it exists
-sudo rm -f /etc/nginx/sites-enabled/default
+# Don't remove default nginx site - let existing apps continue working
+# sudo rm -f /etc/nginx/sites-enabled/default
 
 # Test nginx configuration
 echo "Testing Nginx configuration..."
@@ -147,7 +147,7 @@ echo "1. Go to Azure Portal > Microsoft Entra ID > App registrations"
 echo "2. Create a new registration or use existing one"
 echo "3. Note the Application (client) ID and Directory (tenant) ID"
 echo "4. Add a client secret under Certificates & secrets"
-echo "5. Add redirect URI: https://your-domain.com/auth/microsoft/callback"
+echo "5. Add redirect URI: https://pdf-renamer.your-domain.com/auth/microsoft/callback"
 echo "6. Grant appropriate permissions if needed"
 echo ""
 echo "Next steps:"
@@ -158,11 +158,13 @@ echo "   - CLIENT_ID: Your Microsoft Entra application ID"
 echo "   - CLIENT_SECRET: Your Microsoft Entra client secret"
 echo "   - ADMIN_USERNAME and ADMIN_PASSWORD: Set secure admin credentials"
 echo ""
-echo "2. Update the server_name in /etc/nginx/sites-available/pdf-renamer to your actual domain"
+echo "2. Update the server_name in /etc/nginx/sites-available/pdf-renamer:"
+echo "   - Change 'pdf-renamer.your-domain.com' to your actual subdomain"
+echo "   - Point your DNS for this subdomain to this server's IP"
 echo ""
 echo "3. For SSL/HTTPS, install certbot:"
 echo "   sudo apt install certbot python3-certbot-nginx"
-echo "   sudo certbot --nginx -d your-domain.com"
+echo "   sudo certbot --nginx -d pdf-renamer.your-domain.com"
 echo ""
 echo "4. Reload systemd after updating environment variables:"
 echo "   sudo systemctl daemon-reload"
@@ -172,4 +174,5 @@ echo "5. Check service status:"
 echo "   sudo systemctl status pdf-renamer"
 echo "   sudo systemctl status nginx"
 echo ""
-echo "The application supports ZIP files up to 500MB and will be accessible at your domain name."
\ No newline at end of file
+echo "NOTE: This setup runs alongside your existing app on port 5000."
+echo "The PDF Renamer will be accessible at your subdomain on port 80/443."
\ No newline at end of file