Giving the users the “edit-posts” capability is a good fix for me.
In the future, I will want to give it to users which should not have the rights to edit the general posts on the website and will only have rights to edit specific custom posts that I have created. It would be nice if in the next few versions of this plugin, you could add an administrative option that provides the ability to define a custom capability for it. If it is not defined, it would default to the “edit-posts” capability.
I appreciate your help and really appreciate all the hard work and thought you have put into creating such a great plugin. It’s a wonderful solution for quickly managing the way images display on my website.