I have tried looking for a solution to this problem but I could not find it. I have a KeePass database protected with a master password AND a key file (.key file). I have encrypted the key file with Cryptomator and uploaded it to Dropbox. I would like to access my database on my Android device using Keepass2Android but I cannot get it to point to the key file withing the Cryptomator vault. When I unlock the vault I have the option to share the key file but when I choose Keepass2Android it just opens that app and does nothing. So I wanted to know if this was a possibility.
Hey and welcome 
!
The next big feature of the Android app will be accessing files of a Cryptomator vault inside other apps using a DocumentProvider. For example, a file explorer will be able to access the content of the vault in this way but we are just starting the evaluation, so it will take some time.
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Thanks for the info. When you say some time, can we expect it by the end of the year (2020)?
Hello All. 
Has there been any progress on this feature? I just downloaded and started using Cryptomator today, and so far, I am loving it, but using it to store my KeePass key file was one of my main goals. I have not tried the Android app yet, but I read through the documentation, and it sounds like I would have to actually export the key file in order to use it which would defeat the purpose of using Cryptomator, or am I missing something?
keepass on it’s own is secure enough, no need to put it in ctmt vault.
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You’re thinking of the database file not the key file. The database file is indeed encrypted, but key file is not since it is needed to login to the database file. I would prefer to encrypt the key file at rest so that it is only available when I unlock my Cryptomator vault, but I would prefer not to have to export it from Cryptomator to allow KeePass to see it i.e. the way it works on Windows.
After further research, I found that Keepass2Android has an option to import the key file to internal storage that is only accessible to that app, so it is my understanding that I would only need to expose the key file once, and from then on, the app would use the internal copy which should be safe enough. Sorry, I am new to both KeePass and Cryptomator, so please forgive my confusion on this.
With that said, the idea that @SailReal mentioned regarding allowing other apps to access Cryptomator files seems like a necessary step forward. Without that feature, the usefulness of Cryptomator on Android seems severely limited.