I'm trying out Filen to replace OneDrive, but it appears to be completely unusable. When mounted as a network drive it takes 10+ seconds to navigate through each folder, and opening files (for example a 90kb Excel file) takes upwards of 3 minutes. Closing Excel then also takes another minute because it has to communicate with the drive to tell it to close the temporary one and all that. Using the desktop app instead of mounting isn't a viable option because it doesn't let you open things directly, you have to download and save a file, use it, then manually reupload it again.
Is this just how it is? I've found other people with the same issues but can't seem to see any solutions. People have also reported that it's unreliable for backups because uploads/downloads sometimes just stop quietly in the background without telling you. Is this all user error? Are these programs vetted at all before being pushed or is not being US-based literally the only thing that matters regardless of any other factors?
I'll try out Nextcloud and Drime because they've been recommended in the comments here.