Image URL upload not working, getting Image Could Not Be Added

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I am about to start adding several thousand products & images to a new Shopify site, and the add image via URL is giving me the red box " image could not be added.

Theme is Debut

Site is

Ironically I tried to add the test image to this post via add image via URL, and no problem at all. Just will not work on my product page???

Example of a valid image url is Screen Shot 2020-08-18 at 3.16.44 PM.png