Thanks for your quick reply!
I have already tried this on one pic, but the black thumbnail came back.
I deleted all the pictures on the web interface this time, and will check if I can sync properly as soon as I am back home.
Hope this will work!
By any chance, would you know why these pictures are uploaded incorrectly and mess up the upload process?
If the images are corrupt or get corrupted while uploading ,Lr web will show them blacked out.
I tried this method and now have lost all of the photos that were in the process of syncing. They are gone from my phone, computer, online.
Very frustrating to not only have the upload process take a very long time - photos from 12 hours ago still were not synced - but, then to try a published workaround and then have the photos deleted entirely.
Is there any other way to get the photos from my phone to the computer other than syncing??? Choosing the import photos from Lightroom desktop only shows iPhone pics - not my photos from the Lightroom mobile app.
Also would like to know a way to get my photos back. Wow.