I am having the same problem. Photos are attached to points in Desktop, but after publishing the FC to online, the points have no attachments.
I am having a similar problem. I have several tables with attachments enabled and one with a few hundred photos attached. None of the tables are attachment enabled when I upload the service to ArcGIS Online. It's very frustrating, as there is no indication of anything going wrong.
Hey Justin,
I'd suggest getting in contact with technical support to dig into what is happening with your dataset.
-Kelly