I also experienced some strange issues with the Response Assests. I had a digital bot that had images from the Asset library and it was working fine. Then all of a sudden, it stop showing the images in the bot. I deleted and uploaded again and it worked fine for now. No errors or explanations. Like you, I tried the URL in another application and it pulled up the image. Since the library is just a repository for images, I think I am going back to hosted images on an outside URL until this thing gets settled and we have more documentation.
@Jody Nabuurs, can you chime in and get us better documentation around the library?
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Robert Wakefield-Carl
Avtex Solutions, LLC
Contact Center Innovation Architect
https://www.Avtex.comhttps://RobertWC.Blogspot.com------------------------------