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Try resetting "standard action" in Settings/Apps/DJI GO4 if there is one set. And try to set the USB-Mode to PTP in the popup, if it comes up.

Best regards
Jan

I had a similar problem with an Xperiz Z5 tablet.
So.. assuming it's not your cable, try this:

- Enable the 'developer menu' on your device
- Connect the controller to the device
- Go into the developer menu and look for the 'Select USB configuration' option
- Click this option and change it to any other option but 'charging'
- Change it back to 'MTP'
- Try going into the DJI Go4 app - you should be able to click 'Enter Device' now.

This fixed it for me - unfortunately I can't remember where I first saw this workaround to give credit.