Hi Aravind, I kept looking around for a solution/answer and found this post Is any specific permissions need to give for story map images of Organizational shared users? and I'm guessing that´s our problem. We are using Portal and ArcGIS Enterprise 10.5 and we were able to solve the problem sharing it publicly. And answering some of your questions: we created the cascade app using Chrome and uploaded the images from our computer (drag and drop). Thanks, Maureen.
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