First Of all, this is the platform I’m working in:

Folie WordPress Theme version 2.5.1

WordPress version 5.1.1

WPbakery Page Builder  version 5.6

Php version 7.1.26

MySql versione 5.7.24

I have specific problems with Wpbakery Page Builder Plugin: some custom elements, as “Posts Slider”, “Post Grid”, or “Single Image”, don’t work. I can only use “custom headers” , “text block” and “raw html”.

When I upload an image by “Single Image” custom element for example, I can only see the image in preview mode, but as soon as I update to insert the block, I will see only the gray box with “add an image”.

Moreover, I will see a blank allegated image in the media library replacing the image selected.