I am working with MB Builder and Beaver Builder Themer. When I try to connect to a custom image field it will not show anything on the page. Text and Number fields will show but not a single image. I will show up in the edit post screen but not final post.
The image/file field in Meta Box saves attachment ID in the database. If you expect image URL, you can use the file_input field.
Do you know a way in Beaver Builder that can transform custom field value from one format to another? Then we can add some code to make it work automatically.
When you choose a field to connect to (like a heading field), you'll see Meta Box Field under the Posts group. And from there you can choose which field to insert. Please try and let me know how it goes.