Sync will sometimes lock up if it gets to a "bad" file. However, I have had several times where I've accidently clicked a very large collection and turned Sync on at the Collection level (a confirm panel would be nice). Even if you uncheck the Collection right away, there is no stopping the sync effort after that. The ability to Remove All Pending sync files, like at the Sync Activity panel on the Lightroom Sync Preferences where you can currently right click on a file in the list and remove it, would be much appreciated and save users like me days of effort. Right now and for the last few days (I have slow internet) I am waiting for 27,000 + photos to sync only to then remove them on the lightroom web versions clunky interface.
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