Got the Walmart Onn android TV box. Followed troypoint tutorials to supercharge it. Got Kodi, ftp server and Zerotier running for remote access and transfer. At first, I did the adoptable storage with a 128GB USB flash drive and was able to write to the drive via ftp. I then tried a 256GB USB drive and was not able to write to it via ftp like I had with the flash drive attached.

Suggestions?

Update: it was a problem with the USB enclosure. Used a a different one and was able to write to it like the USB flash drive setup.