Hi. I've lost some important pictures of my daughter's wedding and other events that were downloaded from my camera into Dropbox and then copied into my Mac's Photos library. This was back in 2018. But virtually all of my pictures from that year which had been downloaded into Dropbox have now disappeared from Photos and Dropbox. Any idea what might have happened or if they might still exist somewhere? Should they still exist somewhere in my Mac's hard drive even if they're not in the Photos library? Any advice or suggestions? Thanks. Pete