I suggest that the out-of-date chess.com Help article from over ten years ago :
https://www.chess.com/article/view/how-to-use-the-chesscom-diagr
be updated to point to batgirl's recent (September 2018) forum article:
https://www.chess.com/forum/view/general/how-to-post-a-game-2
Thankyou to chess.com user manekapa for drawing my attention to batgirl's very nice description. And some of the comments add more useful information, as well.
Please can the help article on this topic be updated? https://www.chess.com/article/view/how-to-use-the-chesscom-diagr
It's over ten years out of date.
I wrote this https://www.chess.com/forum/view/help-support/how-to-insert-a-game-into-a-post#43577338 - please look at that? to save me typing it all again - but I suppose that may not have been the right place to put it. Er, well, is this the right place?
I only got done what I wanted, because I was persistent. The help article wasn't much help. chess.com is brilliant! but there are one or two places where things could be better, I think this is one. I'd be pleased to respond, and help if asked if I can, if this suggestion is taken up.
Best wishes, Tessa