@SlackHQ did you change the focus a release or two ago? After attaching a file and pressing enter no longer send the message. Same for cmd+k no longer focusing the latest new chat.
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Hey, actually both issues seem to be resolved now. Thanks!
It sounds like you’re running into a known bug when pressing enter after uploading a file. Thanks for bearing with us while we fix this. 
The change to Cmd+K is intentional, we did this to make the Quick Switcher more accessible for those who use screen readers.