Before you use this plugin you need to enable element detection by ID in Settings > General and Check "Expose the option to add an ID attribute to HTML elements".
How to use:

1) Insert the visual element "Shimmer Loading" in your page. This element must be visible.

2) Insert an element you'd like to create the effect (group element recommended). Insert an ID attribute to this element. This ID MUST NOT contains space.

3) Insert the same ID attribute to the visual element "Shimmer Loading".

4) Optional - insert in the Workflow to hide the element after "x" amount of seconds.

DEMO & DOCUMENTATION
https://erick-personal-portfolio.bubbleapps.io/version-test/shimmer_loading

EDITOR
https://bubble.io/page?type=page&name=shimmer_loading&id=erick-personal-portfolio&tab=Design