Personally, I just use it in a web browser for ad-hoc file uploads. If you’re looking for regular syncing though, supposedly rclone works. https://docs.s3drive.app/setup/providers/#usernamepassword-setup
I actually hadn’t noticed it’s not there for mobile, but there’s search in the desktop view of the website
I’m using Manjaro as well with an Nvidia card and also had the black screen issue when switching to Wayland. I believe this is what fixed it for me: https://bbs.archlinux.org/viewtopic.php?pid=2156732#p2156732