USB adapter: ugreen (cheap brand)
Problem: can't transfer data through USB
It worked first, I could transfer files or photos from an USB drive or a camera. But suddenly it stopped working. The phone still recognize the device, thumbnails still show. But when I select file and click "move", it shows" select local destination", but nothing pops up to select.
Went to setting→device connectivity→usb, it's set on "reverse charge only", can't not switch to any other option, it will just jump right back to reverse charge.
I went to settings, set as a developer, then system option→turn on USB debugging, restarted the phone. Still doesn't work. It's stuck at "reverse charge only".
PS, checked the USB adapter, it worked no problem on my other old smart phone no problem.
Driving me nuts. This function is crucial to me, please help me to fix it!! Thanks.
Best answer by drhouse
If you would like to transfer files back and forth, download the "xiaomi file manager" from the play store in which it will ask if you would like it to read your usb device, click yes and then you should be able to transfer files.
It is mentioned in this thread: https://uk.community.huawei.com/mate-20-series-20/mate-20-pro-usb-otg-problem-1932#post22386
the user in the thread also used a ugreen device like yours.
Hope this solves your issue!