my issue is about insert media in newsletter.
As you can see in attached screenshot, in media gallery (standard) I have no problem. I can upload new images and then see the complete gallery.
But when I can try from e-newsletter wizard "boom", some strange whats happens : no images area show and if I try to upload new one I receive and error (attached).
Attached right media upload, error in newsletter plugin and a list of active plugin.
Note: this is a multisite installation.
Do you have some suggestions?