Mobile:
Go to Assets tab
Select Asset to attach QR/Barcode
Click Edit in top right corner
Select Assign in QR/Barcode field
Choose Input Code Manually, Generate Code, or Scan Code
Click Done in top right corner
Click Update in top right corner
Web:
Go to Assets tab
Select Asset to attach QR/Barcode
Click Edit in top right corner
Select Generate code or input QR/Barcode manually
Click Update in bottom right corner