When you connect your phone with the computer, the ‘USB Debugging’ will pop up automatically, click the ‘Charging via USB’ and choose Transfer Files or Transfer Photos depend on what you want to transfer.
If you are using a Windows PC, you do not need to install any drivers.
If you are using a Mac, please install the Android File Transfer.
If the above conditions are met and but the issue still persists please try the following:
1. Restart the phone and the computer
2. Change a USB cable and connect.
We recommended trying all USB ports if possible, if it is a desktop please try the USB ports available behind the system.