I am trying to publish a Feature Class to AGOL with attachments. The Feature Class has an OBJECTID (Data Type Object ID) field and a globalid (Data Type Global ID) field. In ArcGIS Desktop the Identify Tool provides access to the Attachments.
When I publish to AGOL, and then create a Web Map to display the layer, the Attachments always shows "No attachments found".
If I export the data from AGOL into a File Geodatabase, download it to my computer, and open that in ArcGIS Desktop - I can use the Identify Tool and the Attachments are working correctly.
I used a match table to load the attachments, and I saw a post about turning off the ATTACHMENTID (Data Type Object ID) field in the 'attachment' table. I did that, and republished, but it didn't change the behavior.
I also tried using Query Attachment directly against the AGOL service, but that also resulted in an empty result ("attachmentGroups" : ")
What is the next step in debugging/fixing this problem? Thanks