我想允许 snap 应用程序共享我的屏幕，但不知道该怎么做。我有一个应用程序可以这样做，但另一个应用程序似乎无法做到这一点……以下是输出snap connections discord（这个确实有效）
Interface Plug Slot Notes
browser-support discord:browser-support :browser-support -
camera discord:camera :camera -
content[gnome-3-28-1804] discord:gnome-3-28-1804 gnome-3-28-1804:gnome-3-28-1804 -
content[gtk-3-themes] discord:gtk-3-themes gtk-common-themes:gtk-3-themes -
content[icon-themes] discord:icon-themes gtk-common-themes:icon-themes -
content[sound-themes] discord:sound-themes gtk-common-themes:sound-themes -
desktop discord:desktop :desktop -
desktop-legacy discord:desktop-legacy :desktop-legacy -
gsettings discord:gsettings :gsettings -
home discord:home :home -
mount-observe discord:mount-observe - -
network discord:network :network -
network-observe discord:network-observe - -
opengl discord:opengl :opengl -
process-control discord:process-control - -
pulseaudio discord:pulseaudio :pulseaudio -
removable-media discord:removable-media - -
screen-inhibit-control discord:screen-inhibit-control :screen-inhibit-control -
system-observe discord:system-observe - -
unity7 discord:unity7 :unity7 -
wayland discord:wayland :wayland -
x11 discord:x11 :x11 -
为了进行比较，这里是我似乎无法运行的应用程序的输出（snap connections rambox）
Interface Plug Slot Notes
audio-playback rambox:audio-playback :audio-playback -
audio-record rambox:audio-record - -
browser-support rambox:browser-support :browser-support -
camera rambox:camera :camera manual
content[gnome-3-28-1804] rambox:gnome-3-28-1804 gnome-3-28-1804:gnome-3-28-1804 -
content[gtk-3-themes] rambox:gtk-3-themes gtk-common-themes:gtk-3-themes -
content[icon-themes] rambox:icon-themes gtk-common-themes:icon-themes -
content[sound-themes] rambox:sound-themes gtk-common-themes:sound-themes -
desktop rambox:desktop :desktop -
desktop-legacy rambox:desktop-legacy :desktop-legacy -
gsettings rambox:gsettings :gsettings -
home rambox:home :home -
network rambox:network :network -
opengl rambox:opengl :opengl -
pulseaudio rambox:pulseaudio :pulseaudio -
removable-media rambox:removable-media - -
unity7 rambox:unity7 :unity7 -
wayland rambox:wayland :wayland -
x11 rambox:x11 :x11 -
我已经研究过如何修复它，并且认为也许 screencast-legacy 是我需要的插槽，但我不确定我会使用哪个插件......