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Signal Desktop

Attach a file

CmdU

Mac Desktop app Signal Desktop reference card

Practice this

In Signal Desktop, Ctrl + U will attach a file. On a Mac, press Cmd + U instead.

Where it works: Composer

Every documented variant

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

Where this comes from

Signal keyboard command reference cards - Signal

Documentation checked on 2026-09-14. 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
Upload a file Mattermost Cmd + U

More Signal Desktop shortcuts

Remove the draft link preview Cmd + P
Remove every draft attachment Cmd + Shift + P
Move between sections Cmd + T
Go to the previous conversation Option + Up arrow
Go to the next conversation Option + Down arrow
Go to the previous unread conversation Option + Shift + Up arrow
Go to the next unread conversation Option + Shift + Down arrow
Open preferences Cmd + ,

See every Signal Desktop shortcut

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