Jim, thank you very much for offering help!!
In between I found a solution. It was fortune! I selected the Lightroom preference panel (sorry I work with the German version, so I dont know the exact English wording).
Then I select the Lightroom sync preference panel. It was a fortune that I...
Operating System: Windows 10
Exact Lightroom Version (Help menu > System Info): Lightroom Classic CC 7.2
I sync my LR catalog with LR mobile. "Normal" sync works well, but there is allways one foto left which is not synced. The message is always "sync one foto" (German version).
I read a...