Path for local files should be chooseable

### Is your feature request related to a problem? Please describe.
it would be very nice if the location of the memory for local files can be completely customized. Currently I can choose between 2 locations, but I wanna use a complete customized path. The reason is, that the default paths are truly unuseable on samsung devices with their own file managers. In this case its hard to navigate the whole path doen /android/....../.../.../... /nextcloud/

### Describe the solution you'd like
The possibility to choose the path completely on your own. For example using the path /Internal Memory/Documents.

### Describe alternatives you've considered
Better integration with Samsung Phones.