How can I change this setting please?
It says:
Users at trust level 0 cannot …
So this means level 0 should be allowed to post 1 image , right? But it wont allow my new users to upload any images at all. I haven’t adjusted any settings at all.
what’s the error msg that the user get when trying ?
A new member just reported the same issue on my forum.
The error is “Sorry, new members can not upload images.”
Defined here js.post.errors.image_upload_not_allowed_for_new_user
I have no idea how long my site’s had this restriction, and how I can lift it 
My newuser_max_embedded_media setting was 9999.
I just tried changing this to 25 and I believe the act of making this change has resolved the problem (even though I reduced the allowance!).
I tried impersonating the user and posting an image before and after the setting change.
So I think there’s still some kind of bug here, but for a workaround, try altering that setting.
I’ve had a trawl through the code commits and I think the following change might be related (perhaps my customised setting was stored against the old setting key, and this wasn’t “migrated” to a new setting key?):
https://github.com/discourse/discourse/commit/6391db5921d96f936ac2dd2e60bc86424ef75d95
There was definitely a bug around this, updating to latest should fix it.