I have a Feature Service in ArcGIS Online. It has attachments enabled. I can create a local copy and add attachments to the Feature Service using the Attachment Manager in an edit session. I can successfully sync that copy with the AGOL service and see the attachments online.
I have about 1000 attachments to add. I've created a match table to add those attachments. When I run the Add Attachments tool with my local copy of the feature service in an edit session, I get the following error:
ERROR 001602: fsD8512A816DB3409B8171CAD448C521FE.gdb is being edited.
When I run outside of an edit session, the tool runs successfully, but no attachments are made. The Match Table has 2 fields: a MATCHID field with the OBJECTID of the rows that I want to add and a FILENAME field with the paths to the files I want to add. The files are there and can successfully be added using the Attachment manager in an edit session. The MATCHIDs and OBJECTIDs match up. I can see no reason that this shouldn't be working.
I actually pretty sure I'm doing this correctly. I really want to know if anyone has successfully completed this process; namely adding a list of attachments to a ArcGIS Online Feature service in bulk.