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Mattermost

Upload a file

CmdU

Mac Desktop app Mattermost

Practice this

Press Ctrl + U to upload a file in Mattermost. On a Mac, press Cmd + U instead.

Where it works: Message box

Every documented variant

Variants of this shortcut
System	Environment	Keys
Mac	Desktop app	`CmdU`
Windows	Desktop app	`CtrlU`

Where this comes from

Mattermost keyboard shortcuts

Documentation checked on 2026-09-12. That is a documentation review, not a test run inside the application.

The same task in other apps

Upload a file Linear Cmd + Shift + U
Attach a file Signal Desktop Cmd + U

More Mattermost shortcuts

React to the last message
Bold the selected text Cmd + B
Italicise the selected text Cmd + I
Format the text as a link Cmd + Option + K
Go back to the previous channel in your history Cmd + [
Go forward in your channel history Cmd + ]
Insert a new line in the message Shift + Enter
Start or join the call in this channel Cmd + Option + S

See every Mattermost shortcut

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