How to convert Altium designer PCB files into gerber File.

How to convert Altium designer PCB files into gerber File.
1. Open your PCB file. Choose “File” > “Fabrication Output” > “Gerber Files”.
2. Checked for “Bottom Layer”. And Click “OK”
3. Altium Designer will generates “CAMtastic1.cam”. Choose “File” > “Export” > “Gerber”.
4. Make sure current setting “RS-274-X” and click “OK”.
5. Choose destination to save your file and click “OK”. Remember your file name.
6. Copy your gerber file and send it to Fabrication Lab for next PCB fabrication processes.