I have had success in the past with the collector app offline syncing. I am about to start another project and am testing the offline capabilities and finding issues with deleting features and trying to sync them. So far I have been able to download my data, add points and attachments and sync them up. When I go back into the map after syncing and delete a point with an attachment and try to sync, I get the error
Unable to synchronize replica
The specified attachments could not be edited or does not exist.
The feature is deleted so I can't go back and do anything about it and therefore cannot sync any more of my edits beyond the point deletion. The only option I'm left with is to remove my map and reload and lose my edits. I can delete the features when online.
Any help with this issue would be appreciated.