Uploading an image to ArcGIS Online, which is to be used as a pop-up, requires users to share the image with Everyone, otherwise the image is not accessible.
Last Published: December 22, 2014ArcGIS Online
Bug ID Number
December 5, 2014
August 21, 2020
After review by the development team, it has been determined that this issue is related to a known limitation with the software that lies outside of Esri's control. The issue's Additional Information section may contain further explanation.
Images on popups do not get a token attached.This is expected currently