If I take a picture on my iPhone, generating an HEIC image, I can’t drag/drop it directly into Discourse. The format isn’t supported.
If I open it in Preview and copy/paste the image into Discourse, I get a very dark image (it looks fine in Preview):
If I open it in Photoshop Elements and copy/paste it from there, it looks good (I assume PSE is doing some color-space conversion):
I assume this is a bug in Discourse. I don’t know if it is something that can be fixed without the upstream Discourse developers making changes.

