where are the files in the disc on Mac (el capitan, in my case)?
I did an uninstall, erasing relationated files and folders (~Library/Application Support/Joplin | net.cozic.joplin-desktop.plist in preferences) but with a new installation, the data is the previous. the same notes and the same configuration. and the syncronisation fail…
(I also deleted mac cache with onyx)