cannot save the module : Images are still loading. Please wait until all image s

I cannot save this module as I always get the following error : Images are still loading. Please wait until all image settings have finished loading before saving the module.
you can see the it"s trying to load pictures without succes, even when you select a different directory.

I'm running the site on a local server : MAMP Pro, so no remote access possible
the module : portfolio gallery works fine .

please advise

error from the console :

[Violation] Permissions policy violation: unload is not allowed in this document.
jquery.js?3.7.1:9940
POST https://passion4wood-homify:8890/index.php?option=com_ajax&module=jux_portfolio&method=execute&format=json 500 (Internal Server Error)