Since I’m paranoid, I use a Vercrypt container and upload it to Proton Drive. This gives me security without the risk of losing access to data due to syncing conflicts between Cryptomator and Proton.
Hi.
Unfortunately not as it seems that proton drive does only offer a web interface (and own mobile apps). No WebDAV, no API, no sync client. At least I can’t find one.
Cryptomator would need that to interact with the storage.
@Blue It’s not possible as of now, as @Michael said (thanks Michael).
But, you could you use it indirectly when Proton Drive adds supports auto-upload. But, then you should also be okay with storing all encrypted files locally and in Proton Drive.
And, no your files won’t turn into garbage unless you forget your Proton, and Cryptomator credentials 
Thanks. I’m actually an elephant. I don’t forget.
It’s a shame that they have not yet gotten around allowing API access.
There is a feature request on their feedback site. You can reach it when you’re logged into any of the Proton services by clicking your account in the top right, select get help and then request a feature.
There is a request for WebDAV support, please upvote it 
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They recently opensource their client apps Proton Drive · GitHub
I hope you can add support for proton, as those who care about security probably use proton sevices.
Thank you in advance!
You can use Cryptomator with ProtonDrive using rclone mount to mount your remote drive. Then just create vault over that mount and it works. More details here about proton drive storage module and here about mounting.
or just use the proton drive app (which was not available when this topic was created) to sync your online storage
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Hi,
My apologies for being slow releasing my notes. I don’t have a ton of spare time and working on instructions that will enable anyone to access a drive like Proton from their Android device.
When I do post my information which will hopefully be not to far into the future anyone will be able to access the large number of cloud drives from their Android cryptomator.
Rclone right now works on Android Windows linux and macos.
A very thoughtful developer created an app for Android that implements Rclone on Android.
Leo.