How about adding support for SAF (Storage Access Framework)?

[Typhonling]

With SAF you can view non-local files.
Also with SAF you can add non-local folders, e.g. with CIFS .

Adding network protocols may be complex and bloat the application, SAF is the system framework and only needs to be called locally, which may make things easier. This way we can get rid of BubbleUPnP even more. Kodi is too bloated and difficult to use on a touch screen.

Possibly related to #124