Hi, I uploaded 300 photos to I cloud files in order to share them with a client. Some thumbnails show, others appear as white boxes. When I share the link, same thing happens, some photos show, other thumbnails are just white boxes. Client has to c

I uploaded my photos to creative cloud to share with a client.  Unfortunately, a lot of them show as a white thumbnail, not a picture.  When I send the link, you scroll through the photos and a lot are white thumbnails.  If you click on it, you can see the photo, but its a pain as you can't quickly scroll through and see the ones you like, you have to click to see what it is.  Any ideas?