Very important feature for a cloud file service. Should be implemented in a way so that apps like rclone can make full use of it, if the nature of Proton Drive allows for that. But a dedicated sync app in the tray is top priority.

essential feature that we need.

As others have stated, if Proton Drive had all the same features as Dropbox, I'd switch right away: all Unix/Linux commands working seamlessly, auto photo upload, selective sync, option to have hard copies of given files/directories on a phone, etc... And, if Proton could improve status and error reporting, even better!

Or, way better (at least for me) would be an option to mount it (but not actually sync to local disk, just get files on-demand), like gdfuse for Google Drive

File Sync client for Windows is out - would be great to have the same for Linux. One thing that made it easy to use Dropbox was that from early on there were clients available across Windows, Linux and OS X, so it was painless to sync across the diverse machines in a team.

I'm on about 1% usage of the driver and I can't really use it without this feature. I just want to use a normal file browser (on any OS preferrably) to move files around, kind of like nextcloud. Othewise this storage space will just lie empty forever because the web UI is too cumbersome

Like for Proton VPN, as a Proton Unlimited customer I feel Proton Drive without a client is pretty useless to me (don't really use it) and will probably not renew my membership once it expires - simply because without a native Linux client, how I am supposed to really use Drive?

I support Proton's mission and ideology, but feel very disappointed that as a Linux user paying full Unlimited price, I have a buggy VPN missing a lot of features, and a Drive I can't really use...

Same as every one. As my files don't sync with the drive, i don't use the drive.

I would pay to have such a feature released on linux and *BSD.
I will switch from syncthing

I will abandon every free cloud storage provider and will pay for Proton drive if I can have this feature.

This feature is necessary if I'm to invest in Proton Drive. Without this feature, the workflow is nonexistent, and the sole reason I'm not going to move forward with upgrading. There's no point in divesting from OneDrive or GoogleDrive unless this feature is integrated. I do all of my work from my MacBook and the inconvenience of downloading and uploading tons of files a day is ridiculous and defeats the purpose of a storage service. I need my files to be synced in real-time so that work is not lost should a program crash or something happen.

Like many others, the only reason for me not to upgrade to unlimited, is not having a supported Linux client for the Drive.

Literally the only thing keeping me from giving you all my money

I'd be happy if Proton Drive had a linux client that would allow me to mount my Proton Drive on my local filesystem. Having it with the ability to sync data would be nice but not absolutely necessary. I could use rsync to keep the various directories I wan backed up backed up on my Proton Drive and synced with the local directories they'd be backups of. There's a third party app that lets me mount my google drive account on my linux box,. I use rsync to keep directories backed up there, but I'd like to give up the google account.

I need this if I ever want to use proton drive properly. Manually dragging and dropping is... okay... but automatically syncing and being able to save files "directly" into the cloud (or into a synced folder) is worth so much with my workflows

a must have! especially if you are serious about all the open source talk :). Joke aside, I would really appreciate such an app and definitely migrate my existing tresor-drive solution.

Same here this feature is critical of I want to migrate from my nextcloud instance

A linux sync client is the only feature holding me back from upgrading to the unlimited plan.

Proton team you are awesome. A little step more please !

That's the only reason I didn't upgrade my account yet, but I don't know if this could create some kind of security issue. Nevertheless, it's a must have feature.