Add Refresh Button in External Request
Currently if you add anything new to the external request you have to save it then open the action step again.
Then test, by having a refresh button in here. it would save what you put in place so that you can save on excessive clicks.
People that spend extensive time in ManyChat know how powerful the external request feature is yet it is a frequent hassle to constant double-click the action or refresh the page just to get a new test off.