How to show image in ticket history or articles?


I dont understand how to show image in ticket history and articles.

I can see images during articles edit or ticket reply/comment in CKEditor. My user receive images as inline encoded in base64 in mail.

In ticket history i can see image when i download the html source.

But image dont show web UI and i’m unable to find the option needed to show image in ticket history.

In my i have those options:
Set($ShowRemoteImages, 1);
Set($ShowTransactionImages, 1);
Set($PreferRichText, 1);

Any idea?

Kind regards,

Edit: the problem concern images inserted via copy/past in CKEditor. Images receveived by mail are visible in ticket history.