Hi,
Some of my items are graphic novels and comics.
For each item, I create a child note with some informations, comments and so on. I include the cover image in the child note : both an URL and the image itself (imported with a "Copy-Paste" simple process).

The cover image is well imported and I can see it in my child note when freshly imported (copy-paste) - see screenshot 1. No trouble here.
https://s3.amazonaws.com/zotero.org/images/forums/u2823213/g7k6lrylwtq6h7m412ii.png
But a few days later, some images in child notes disappeared. The border frame for the image appears, but not the image itself - see screenshot 2.
https://s3.amazonaws.com/zotero.org/images/forums/u2823213/ogz0gmq3k845q24909y0.png

I don't understand what I have to do to make all images permanent in my child notes, as some are left and others not.
Does anyone have any clue about this behaviour ?

Thanks a lot !