I've been using the pop-up window to display images inside of the pop-up windows of AGOL. I would paste the link inside of a field to hold the URL generated by attached image. What I'm requesting is 3 fold:
1. Permit the posting of an image inside of a pop-up window with a token that will never expire
2. Allow for the centering or other positional locating of the image inside of the pop-up window
3. Allow for the resizing of the image inside of the pop-up window.
Currently this is done by CSS located on the Amazon Cloud server, with no (that I'm aware of) way to control these parameters.