Problem:
The normal workflow to edit posts doesn't work with Elementor. When clicking the link to edit a post, the full post is displayed rather than the edit form.
Solution:
Instead of the normal Toolset workflow you need to add the edit form to a standalone page (you can design the page in Elementor, or not), and when linking to that page to edit a post, pass the ID of the post to be edited via a URL parameter.
Problem:
When adding a gallery in a rfg the contents is not visible in the WYSIWYG editor
Solution:
We found that if you add gallery shortcode to custom WYSIWYG field that is related directly to post type it does render the images but repeating field group having WYSIWYG field that holds the gallery shortcode does not render the images.
The result you get is expected one and we may consider it to improve in future but there is no ETA.