Sorry that you are unable to sync images as the app is stuck syncing
Could you please take a look at the mentioned in this discussion LR Classic CC stuck syncing images and let us know if that helps?
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Try going into preferences > Lightroom sync > hold down the option key and tap the Rebuild Sync data button.
You might also try deleting the images that are causing the error by going to the Catalog panel > All sync errors > Remove.
You made my day!, that OPT trick was simply wonderful. added to my LR trick bag
I'm having this same trouble.. Stuck in the UPload. Will not sync to the ipad anymore. Tried the options above already