Proton Drive Android App — sync with a local folder
I would really like the ability to not only have the offline-available files be accessable from within the Android app, but to also be able to specify a local folder on my device where those files would be located, so I could access them from any other app. Any remote changes are synced to the local files, any local changes are synced to the remote files. One of the reasons is that I need a way to sync my KeePass database between my desktop and my phone. Right now I'm using OneDrive for it, which I believe provides some kind of API for app developers to be able to sync changes between the cloud and the app. It's the only thing I'm using OneDrive for, and I'd really like to finally stop using it.

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Xavier commented
I have exactly the same need. Many apps (notes app for example) only offer to browse local files. Having the option of saving all or part of the drive locally on the phone would be a huge advantage, especially as the competitors don't offer it.