Created collection with 134 images using desktop LR Classic CC, but only 130 synced to LR Mobile or to the website that becomes accessible after making the collection public. Deleted the 4 missing images from desktop collection and added them back. One synced to Web, but the other 3 just won't sync. Seems to be particular to these 3 images. If I add a completely different image, it will sync. Problem appears not to have anything to do with the iPad on which I typically use LR Mobile, as the web version doesn't show the missing images either. Currently, there are 134 images in the desktop collection, but only 131 on web or either iOS device. Rebooting computer didn't help. Running LR Classic CC Rel 8.2 Build 1204643 with Win 7 64 bit. For the record, iPad Air and iPhone X are each running LR Mobile 4.2.0 411412 with iOS 12.1.4.