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Getting a link from CMS to work on a embedded catch

I am trying to get a link from a cms custom field to use in a fetch in the embedded field. The reason being I want to be able to upload multiple images to webflow in one box. But can only see the option to upload one file at a a time.
Attached is Image.
Any help on how to add link to CMS or to add multiple files to CMS would be much appreciated.


Here is my site Read-Only: LINK
([how to share your site Read-Only link][2])

[2]: Share a read-only link | Webflow Universityemphasized text