I have looked at the previous threads regarding FiiO/Android Devices/MicroSD cards and getting them to sync with Musicbee.
I have tried the following
https://musicbee.fandom.com/wiki/Manually_Change_Root_Storage_Path_for_External_SD_Card
but ofcourse I cannot find any "Root Storage Path" in the appdata folder.
http://www.cboydston.net/?p=2061 I have also tried this.
I am starting to think this is a waste of time and will probably just return the device. The lack of documentation from FiiO is frustrating.
Any help on what I am doing wrong would be great.
What I've always done is just avoid the hassle and sync use a card reader. My old Fiio X3 was pretty slow for transfers so that was a no brainer, but the process works jus as well with my Shanling and Sony players too.
Just plug the card into the reader (external works fine), sync your music/playlists, then move the card back into the device.
Regardless, I find syncing directly to the device is pretty much the same, just slower (IIRC Musicbee just treats the device like it would a SD card)
Also, you want to make sure the M7 is set to storage and not DAC in it's USB settings