@synacksyn you can directly upload images lol. and I think if you embed them in text they have expandable option? Test image... your previous posts that I saw just posted a "link" rather than doing a text article with image embed, or direct image upload. which is probably why it wasn't expanding?
You can enable inline images with the "Auto media preview:" under the cog menu. Be aware you may see NSFW images, because those tags do not properly federate from lemmy instances.