Seriously, the only way I can get Paper to recognize my tabs and double returns is to paste from PROPRIETARY and EXPENSIVE software? I’ve tried BBEdit, (Apple) TextEdit (rtf and txt), Libre Office, and OpenOffice; when pasting from none of them will Paper behave like every other piece of word editing software since, oh, the 80s.
This behavior is independent of the browser (Chrome, Firefox, ...Edge).