Forward of files from shared folder not possible (only!) in app

As the first issue got closed, but the bug still persists, I just issued this new issue, now with screenshots showing the problem.

Initial issue: https://github.com/nextcloud/android/issues/5681

### Steps to reproduce
1. User A: create folder F and share with internal user B with all rights granted
2. User B: login into web interface with browser -> forward of arbitrary file from folder F is possible (clicking on icon (A) indicating that the file is owned by user A)
3. User B: open android app (newest/current version) using stored credentials of user B -> forward of thats same file is NOT possible (clicking on icon (A)) only opens detail menu allowing to copy via link

### Expected behaviour
- The app should be able to forward/share (exact string in german app: "Senden/Teilen" not only files from folders created by oneself but from other users, too (if settings allow to do that) - like shown in "Steps to reproduce" the web interface is able to do that

### Actual behaviour
- As expected forwarding is possible via the web interface but not via the app.
- Workaround in the app for user B: copy one file owned by user A in an arbitrary own folder (owned by user A). Magic: suddenly it is possible to forward that exact file and at the same time another icon is used by the app (not circle with first char of username but sharing-icon)
- 3 Screenshots -> 1: for folder-owner (user A) the option "Senden/Teilen" is offered/shown by the android app | 2: for a privileged user (user B) the option is NOT shown | 3: yet for the privileged user (user B) the share option is shown in the web GUI