You can do it from thunder, at least with external image hosts.
Just like this. 
this post was submitted on 09 Aug 2023
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Yeah, you can do it by links. But some other apps add it directly to the comment body without a link. You can do it on browser too I think.
I thought you just wanted at way to show images in a comment, not upload an image from local storage.
My bad. 🙂
It's all good. Someone said that the submit comment screen is getting overhauled. So maybe it'll be there soon.
Hmm I don't think that functionality exists at the moment. The good news is that the create comment screen is currently getting a major overhaul. It will soon match the create post screen. So I imagine posting images in comments will get added then :)
Oh cool.