I had followed the Esri Imagery Workflow for OIC and published and view the Esri Campus images using OIC web app, and it worked well.
I tried to use my images which I took using an IPhone, selected terrestrial frame camera as type, however my workflow involved using local images because I didn't have access to S3 at the time. The exposure points were created and everything worked fine and may have selected the add image as attachment when publishing to Enterprise therefore I was able to view the images on the OIC web app.
However, the problem seems to arise when I hosted the images on Amazon cloud. The bucket where the images are stored have been public, and the links work fine. However, when adding the OIC to the web map, and clicking one of the exposure points, it takes forever to load up the images.
I've attached my ImageList text file, in case someone wants to replicate the problem