*Feature request*
Please add a setting that lets the user choose where Proton Drive's macOS cache and/or mount root lives — for example, a folder on an external volume rather than the system disk.

*Background*
The macOS Proton Drive client uses Apple's File Provider framework. This forces both the visible mount (~/Library/CloudStorage/ProtonDrive-…-folder) and the underlying blob cache (/private/var/folders/<hash>/T/com.apple.fileprovider.ffp/…) onto the boot volume, with no documented way for the user to relocate either.

*Why this matters*
For users on Macs with a small internal SSD and a large external drive for media, documents, and archives, this is a hard blocker. Every file synced to Proton is duplicated locally as cache on the internal disk, so the practical sync ceiling is "whatever fits on your boot volume" — not "whatever you have on the external drive you actually store data on."

iCloud Drive, Dropbox, and OneDrive all have the same limitation because of Apple's File Provider design. Proton has an opportunity to differentiate by offering control here, which would directly benefit users with external-storage-based workflows (creatives, developers, archivists).

I would like to be able to choose the folder on my Mac that syncs with Proton Drive. This was a very important feature with Google Drive that I'm sorely missing after my switch to Proton.

This is a huge blocker for me finishing the switch from Google. I need to map my folder to a drive large enough to complete a full sync before I can use the 'online only' feature to reduce space. Please fix this!