Mattermost
Upload a file
In Mattermost this is upload a file. It applies here: message box.
Where it works: Message box
Every documented variant
| System | Environment | Keys |
|---|---|---|
| Mac | Desktop app | CmdU |
| Windows | Desktop app | CtrlU |
Where this comes from
Documentation checked on 2026-09-12. That is a documentation review, not a test run inside the application.