02-14-2019 06:37 AM
Well, today USB transfer is in working order.
I decided to test with the USB cable that came with the phone, instead of the cable I had been using before.
Apparently the android 9 is quite sensitive with the voltage drop in the cable. If your cable has dirty connections or a amperage rating of less than 2.5amp, the OS will automatically determine that data transfer will not be faultless and will switch to charge-only mode.
That's my hypothesis today.