[snap] libreoffice fileselectors does not show thumb drives

Because of the move to a snap, when one opens the file dialog usb/thumb drives are not shown. For a File->Open you can navigate to /media/user-name/thumb-drive if and only if you personally have mounted the thumb. For those of us writing documentation using screen shots taken on many different systems but all on the same thumb drive this is a real hassle.

Prior to Snap packaging this worked.

I suspect this is a nasty bug in Snap.

roland@roland-amd-desktop:~$ lsb_release -rd
Description: Ubuntu 20.04.1 LTS
Release: 20.04

LibreOffice Writer
Version: 7.0.2.2
Build ID: 3a01483fc371ab18cfca4bab0d636937da5eaf70
CPU threads: 6; OS: Linux 5.4; UI render: default; VCL: gtk3
Locale: en-US (en_US.UTF-8); UI: en-US
Calc: threaded
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.12
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 20.04
GsettingsChanges:
 b'org.gnome.nautilus.window-state' b'sidebar-width' b'182'
 b'org.gnome.nautilus.window-state' b'initial-size' b'(757, 500)'
 b'org.gnome.nautilus.preferences' b'show-directory-item-counts' b"'always'"
 b'org.gnome.nautilus.list-view' b'default-column-order' b"['name', 'size', 'type', 'owner', 'group', 'permissions', 'where', 'date_modified', 'date_modified_with_time', 'date_accessed', 'recency', 'starred', 'detailed_type']"
InstallationDate: Installed on 2020-04-17 (218 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
NonfreeKernelModules: nvidia_modeset nvidia
Package: nautilus 1:3.36.3-0ubuntu1
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.4.0-53.59-generic 5.4.65
Tags: focal
Uname: Linux 5.4.0-53-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
usr_lib_nautilus: