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 :)
this post was submitted on 09 Aug 2023
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Thunder App
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Oh cool.
You can do it from thunder, at least with external image hosts.
Just like this. 
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.
I think it depends on the front end you are using
Wouldn't Thunder be the front end if you're using it?
Can you elaborate?