Working in shared channels with other workspaces? Use internal team comments to minimize context-switching.
Make a comment on a thread with [⌘⇧M]
Q: Why aren’t Labels, Comments, or Assignments working?
A: Make sure that you’re selecting a single inbox item — not a group of inbox items. You cannot perform these actions on groups of items (yet!).
You and your team can write internal comments to each other on any item. Hit [⌘+Shift+M] to focus the comment text field.