iOS App: End-to-End Encryption not working when using Share-Menu

Hi all,

I am struggling with the following issue:

I want to use the iOS Share-Menu in another app (a document scanner app) to upload a file to an encrypted nextcloud folder. The upload itself is working, but the problem ist, that the file is uploaded unencrypted and therefore it cannot be synced to other clients.

Is this issue already known? Is there an updated planned?