EDITED to knock off a star... it is CATESTROPHICALLY slow to sync. I have 40GB in my proton drive... it has so far taken 2 days to sync just over 6GB.It works with Proton Drive. It only actually syncs when you are connected via VPN. Some decent documentation and basic instructions would be handy, especially for those who are new to Linux.
Didn't work for me on Proton or Google. Just a blank window where I'd expect to see a directory structure. Adding a directory manually results in a crash with "Unknown Error".
Worked quickly an efficiently with minimal set up. I used it for Proton Drive but works with many others