[Usability]: Add the same permission-possibilites when sharing a public link like on the WebUI

[markthebro]

Is your feature request related to a problem? Please describe.

When a user wants to share a folder using the Nextcloud App there are currently only three permissions available:

• View only
• Allow upload and editing
• File drop (upload only)

But sometimes you want to share a folder where friends and family can e.g. upload photos + see the current uploaded photos there without the possibility to modify/delete the current uploaded ones.

Using the Nextcloud Web UI custom permissions are possible to fulfill e.g. the mentioned need before.

Describe the solution you'd like

The same interface for the sharing options like on the WebUI.

Describe alternatives you've considered

Currently there exists, at least from my point of view, no alternative - the only thing that is possible to change permissions using the WebUI....but actually therefore I have an App.

Additional context

Let me show you the current status quo using Nextcloud App 3.28.2.

And these are the possibilities using the WebUI - Custom permission can be selected.

And afterwards the permissions "Read" and "Create" can be selected to fulfill the mentioned use case: Possibility to add new files as well as see the currently uploaded ones.

This kind of feature is nice when sharing e.g. photos - one person provides a safe place to upload photos and shares the e.g. password-protected link. By knowing the password other persons are allowed to login, upload photos as well and can see the uploaded stuff from other people as well but have no possibility to delete/modify uploaded files.

[markthebro]

If this product enhancement will be implemented, it should also find its way to the iOS app....