!Friendica Support I also sometimes don't see pictures in posts, both from friendica and from mastodon. I do see them if I open the link to the original post.
I'm not sure but if I view the image on the original platform (mastodon/disapora), then it seems to be loading on friendica too. Can't reproduce consistently though, so I'm not sure

Example here: https://nerdica.net/display/72d36f80693e01386951268acd52edbf
(for some reason I can't reshare that post: the preview in the post editor doesn't load, and if I click the button to send the post, it loads for a second and then does nothing)