Most common usecase is screenshots: I suppose most of the users of Asana got used to make screenshots to clipboard (not to file), i.e. on Mac it is done using shortcut
shift+control+command+4. After that I always go to app (i.e slack, telegram, github, trello, etc) and just use
cmd+v to attach this image. Looks like it is much faster than saving screenshot to desktop and attach it as a file.
Unfortunately it doesn’t work in Asana. Would be awesome to see this feature!