Add listing image issues

Hi again!
I started to add listings and basically it works fine except the handling of images.

Upload in frontend does not work properly. Picture appears in search result list but not in detail page. Once I upload any picture in frontend I cannot edit the images in the backend either. If you try to add or update the listing in the backend and go to Preview then you see all the images I have tried to upload in the various attempts. So all a very confusing.
The listing to look at is Mares & Marinheiros in Horta

If I do not upload any image in the original frontend add listing, I then can successfully add pictures in the backend.

If I do all in the backend no problem. But that is not the goal of the site.