Also I think the LibreOffice file picker is still missing something. Snapped apps should work the same as apps packaged by other methods and the file picker currently isn’t meeting this ideal.
(LibreOffice 5.3 file picker on the left, Files 3.20.4 on the right)
I don’t have the LibreOffice Deb installed at the moment (and my Internet is too rubbish to download it) so if someone could screenshot the file picker in that, that would be helpful!
It may be that the LO snap needs more permissions or snappy needs some fundamental change to ensure feature-parity but whatever is necessary should be done so this works the same as the Deb (and other packages) out-of-the-box. Imho.