Gnome Boxes shared folder does not automatically appear in Files whereas it does in Nautilus

### What Happened?

Running OS8 in a Gnome Box, I shared a folder on the Horus host. An item appeared in `network` relating to a spice share but this could be opened. To access the folder required manually entering the correct location (`dav://localhost:9843/`). This could then be bookmarked. By comparison Nautilus showed the shared folder immediately as a separate item in the sidebar.

### Steps to Reproduce

See above

### Expected Behavior

Files immediately provides direct access to shared folders in Gnome Boxes (Uses the spice-webdav protocol)

### OS Version

8.x (Early Access)

### Session Type

Secure Session (Wayland)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_