Issue that I’m going to mention is already reported(I also reported and provided necessary information) and known to Volumio team, but it is not yet mentioned in known issues list. This issue is tested on ASUS Tinkerboard 1 (without S) and still exist in V 3.179.
After Volumio 3 came out, I updated my system. Updating itself went without any problem. However Volumio 3 is unable to automatically recognize and mount external USB drive if it is formatted into ext4(Linux). I tested drive with exFAT file system and it worked fine.
There are two solutions at the moment:
SOLUTION 1 - If version 2 is working and version 3 doesn’t offer nothing new and necessary, it is good idea to stay with it at the moment.
SOLUTION 2 - Volumio 3 base system itself supports ext4 and drivers are working correctly, problem is somewhere in UI component. To use drive that is formatted into ext4, it is necessary to SSH into Volumio box and manually mount it into “/mnt/USB” After mounting it is also necessary to manually rescan music collection “Settings->Sources->Rescan”. Manually mounted drive is visible until restart, then steps above must be executed again.