Paused sync and continues next day - sync all again?


Yesterday I synced 5500 of 8400 pictured and had to pause it because my battery ran out.
So today I wanted to continue. And now its starting from scratch, “syncing 1 of 8400”!
Do I really have to sync it all again, or does it actually only sync the pics I did not sync yesterday even though it says of 8400?

I’m syncing to the same folder on the iXpand.

Thanks for answer!