I Try to use LIghtroom Mobile special the sync funktion with my libery at home. But now i have a problem. There are only previews of newer pictures that i add to the sync folders in Lightroom. There are now previews from older pics that i sync before. So I Try to disabel the sync from the folders.. and start a new sync... same result. I create a new folder with the same pics... same prob. LIghtroom Mobile show me the correct numbers of pics in the folder. but only black placeholder without content. Is there any cash that i have to clean up to fix this problem?