Instead of just allowing machine-specific sync to the cloud, allow for a cloud-storage option which multiple machines can all sync to & from bidirectionally, allowing all computers to have the same set of files. Add one in one machine, it should become available in all machines. Delete one in one machine, it should get deleted everywhere.

Something similar to Dropbox or OneDrive. Makes managing files much more seamless and easier instead of having to try and find which machine I first synced the file on.

This will give a true alternative for users to move out of OneDrive/Dropbox and adopt Proton Drive as their mainstay.