Unable to upload via "save in files". Files integration in iOS broken?

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Since the last update of the NC App for iPhone the files integration seems to be broken. The button for direct upload is always grayed out. Also is there no possibility to add NC to favorites Apps.

Is there any solution for this problem?

iOS 14.6 running here.

Unfortunately I have the same problem here. NC integration is still visible in Files app (with icon missing) but there is no content available when selected. Also nextcloud is no longer available for sharing.
I already removed my account in NC app and logged in again. I also reinstalled the app.
No change.

Nextcloud Server 20.0.3, App version 4.0.4.0