Collector with Attachments will not synch: I finally got a collector app working in the following configuration:
Point Feature Class with attachments enabled published on ArcGIS Server 10.2.2 with sync enabled;
Webmap in Portal for ArcGIS (also 10.2.2);
I can access the map and create an offline copy on a variety of Android and IoS devices.
I can create new, and update point features and sync them (most of the time).
When I create or update a point feature AND attach a photograph to it, sync fails every time with "Illegal start of token [<]".
Since this works when I'm adding or updating features with no attachments, I'm pretty sure that the service and Portal is configured correctly. Why would collector stop working when attachments are added to the mix? Unfortunately, due to IT policy, we won't be able to "upgrade" to 10.3 which, at great cost, involves dozens of servers and thousands of desktop clients.
Is there a fix for this in the 10.x suite?