cloclo Thank you very much for sharing log file!
I think I see the problem now. For some reason I don’t yet understand, every image file is getting transered with the name FullSizeRender.jpg even though it is clear from metadata that those are different files. That explains why you have this file but no other image files (they just overwrite each other and only one remains).
After some googling it is clear that it is Apple who returns this name to the application of you have been editing your file on the phone. It looks you have edited few of your files and now they all appear to TonfotosSync as FullSizeRender.jpg (even though they appear normally over USB).
This is definitely not good. I will need more time to investigate the issue and will keep you posted.