In Liftoff, the Lemmy app I use, you can easily add a picture when writing the post/comment, which will then be hosted on the instance. It's probably the same for other Lemmy apps. The websites I'm not sure about, since every instance can have multiple web frontends.

I know I'm replying to a month-old post, but I hope you'll figure out a solution, since we very much still need to see this.

Also, if at all possible, please include some proof of those super creamy eels?!

Thank you very much!

Example - it works:

(Made with JS Paint, a retro MS Paint clone in the browser! Remember this brilliant technique for making "art"?)