I can’t post multiple images on this site which is seemingly the only other non-dead internet forum on the whole entire web. Got temp-banned for making a “threatening” joke against house centipedes. Got twmp-banned for answering an AskReddit question. Got shadowbanned for posting about my two temp bans.
You can, you press the tiny image icon above the text that you’re typing and you upload one, then it creates a link to the image in the lemmy servers which mqnifests as an imagine in the body of your post.
It will look different to this because you’re in lemmy.world instance but it works just the same