I have LR Classic, and LR web, aI want to synchro my photo... but it stay blocked, I always have 16 photo t synchro, I don't know how to resolve that!!

Hey, @Toniodesiles. Welcome to the Lightroom Classic Community. I'll help you figure this out.

Lightroom Classic does not sync directly with the Lightroom desktop or mobile; you'll have to check Lightroom Web (https://adobe.ly/4eF2E7u)

In Lightroom Web (https://adobe.ly/4eF2E7u), look for the Deleted Section and the Sync issues tab (if they exist). Emptying both of these has helped in the past. Before emptying these tabs, please ensure you have backups for the images.

Now, to pinpoint which surface, or direction, is having the problem syncing, you can try this.

1 - In Lightroom Web, drag and drop an image, then apply a few edits.

2 - After a while, check Lightroom Classic to see if the image synced down to Lightroom Classic.

In Lightroom Classic, you can move the synced images to a new collection and check if the new collection syncs to the cloud.

Thanks!
Sameer K