This one's got me puzzled. I've got a 12,000-record point feature layer, with a single small (150kb) photo attached to each record. This was published from ArcGIS Pro to ArcGIS Online, with the attachments. When I attempt to "Create View Layer", I get an "Error - Unable to add feature service definition". I've disabled Sync and Editing, and also changed sharing to Everyone, all with no change. Any ideas?