Loss of connection in the middle of backing up albums from iPad

In the middle of a successful transfer of many photo albums from my ipad to my Mac computer using computer app, suddenly I am getting a message on the computer app hat there was error communicating with my device - suggesting that perhaps the iPad app is not the latest version ( I downloaded it today) My device is hung sending files so I can't close the ipad app. Everything was going so smoothly and I can see many of the photos and albums have been downloaded already.

When I do reconnect, does the app sync or re-transfer the photos already on the computer.