This photo display in the closed group if user no logn-in. So, would I change this notification by another topic add-in below letter “Access denied” or direct to another links required sign in/sign up to see the topic. Thanks.
Hmm, no, that looks like an actual error. It looks like the link you are using is incorrect since it is trying to find the topic by slug.
That is no an error as wrongly URL
This URL is designation for closed group. I was access as a visitor without sign-in. Could you have any other advise?
Does your url end with a topic_id? Or just the slug?
Are you on latest? There was a be feature added recently that will tell people to join a group to see a topic if the group allows people to join.