Today we tested the collector app for field data collection. We ran into an annoying problem. As we need to collect data offline, we work with downloaded maps. One of the two Android tablets we used synced perfectly fine, the other one only synced the features and not the attachments (photos). After testing some more, I found out photos are uploaded normally when working 'live' with an internet connection, but not when working in an offline map and syncing them later. The features are uploaded without attachments. What can I do to allow syncing of attachments after offline data collection?
UPDATE: strangely enough, when I edit existing features I synced before, and add a new photo, the attachment does sync. New features are still not synced correctly though.