If you mean the thumbnail that is added when you add a post, this is done automatically by the Lemmy server. Otherwise, I don't quite understand what you mean.
this post was submitted on 29 Jun 2023
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Yes, that's exactly what I am talking about. You are the only one for whom thumbnails appear as far as I've seen. I tried both on desktop/mobile browsers, and three different Lemmy apps. Nothing appears for me.
Edit: could it be that the reason is that I am registered on lemmy.world instead of lemmy.ml? I also have the "pending" bug.
I think it's either a bug with Lemmy or it has trouble getting a thumbnail from the linked website. I see thumbnails for things linked from mangadex but not mangaplus.
It depends on the link you're accessing and how they're set up more than lemmy.
I imagine it must be more of a Lemmy issue with not retrieving previews, but good question I didn't even notice until you brought this up here.
It does seem like previous posters have managed to do it though, hopefully they see this post!
I actually sent them a DM but never got a reply. :(