Possible to sync URL layers for offline use?

[NickAddison]

Have a Field Maps with layers from a hosted feature layer and from URLs. Is it possible to enable syncing on the URL layers so that the Field Maps can be used offline? If so, how?

Note, the URL layers are from the organization's rest services. Pulling from this source since it is already updating daily via task scheduler (e.g. parcels, address points, etc.), thus providing the Field Maps with "live" data. 

[DanielFox1]

The data won't be updated in realtime if you have an offline area, the area would need to be synced and recreated with the updated before being taken offline. This ensures that you are seeing the latest data at that given time. 

For realtime updates the use of online would be better. 

The main thing to be careful of is the data that is being updated doesn't change schema when an area or that data is offline otherwise you will have issues syncing the data back.