How am I supposed to go about "Rebuilding Sync Data"?

Question

So, after updating to 13.3.1 (Mac OS Sonoma 14.5) I was still having "syncing 15 images" stuck forever with zero images in the "sync errors" folder. I decided to "rebuild sync data" and clicked on that button and Lightroom restarted and set the sycn on pause. I have pressed "resume sync" and the 15 images syncing are still there, but no RE-syncing of the whole lot (I have thousands of images). After pressing the "rebuild sync data" button, Am I supposed to wait leaving sync on pause untill it is reinabled automatically? Why the heck Adobe does not tell us what to do next after we press that "rebuild sync" button, and why the heck there is no progress message saying like "rebuilding sync data 20% done"?

johnrellis · Answer

The easter-egg button Rebuild Sync Data that magically appears when you click Opt/Alt in Preferences > Lightroom Sync is a holdover from the pre-LR 13.3 reimplemented sync engine. Adobe employee Rikk Flohr says: "Using the [Rebuild Sync Data] button as a troubleshooting step in any stuck sync for version 13.3 and higher is no longer recommended. We anticipate this button will be removed in a future version."

Many people are experiencing stuck syncs in LR 13.3. See this article for comprehensive troubleshooting:

https://www.lightroomqueen.com/troubleshoot-sync-with-classic/

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