Tyler,
When you say you
published my server maps to AGOL
what do you mean, are you using map services with feature access in AGOL?
If you are making edits from Collector App and ArcGIS Desktop, on the same data (service), Feature services include a Sync capability that allows clients to make edits locally and synchronize the edits with the feature service. Edits to the local copy can be made when offline, whereas network connectivity is required to synchronize. In order for the Sync capability to be enabled, the data in the service must be able to support Sync.
However, if you want to enable Sync capability, and you need this layer in your service, you will need to configure your data for Sync. All layers must be either versioned and contain a Global ID field or all non versioned, archive enabled, and contain a Global ID field. If the layer participates in a relationship class or has attachments, the layer and related table or attachment must be related using a Global ID field as the primary key.
Please refer Prepare data for offline use—Documentation (10.3 and 10.3.1) | ArcGIS for Server .
I hope this helps.
Regards,
~S
~Shan