Some Android apps, usually from cloud storage providers, implement an Android facility from the storage access framework called “document provider”. This allows other apps to query for content on that app that might not necessarily reside in the filesystem, and with more granular access control than if it were stored say, on an sdcard.
While cryptomator makes use of this feature to write and write to a vault, I couldn’t find an option to allow other apps to write to and read from a vault trough it.
I planned on using this app to backup my WhatsApp directory (with images, audio files, documents and messages) to a vault hosted on a cloud storage provider I don’t trust enough to give it all the content from my main im platform on plaintext, for this I’d configure synchronize ultimate to put everything on “/sdcard/WhatsApp/” to a vault managed by cryptomator, every day at 3am. Sadly this wasn’t possible, as cryptomator does not implement a document provider at the time of writing.
Please add this feature! I hope I made a strong enough case for the devs to consider implementing this in the future, I could try adding this feature myself, but iirc the source code for the app is not publicly available. Thanks for reading!