Tonido Sync doesn't sync some files with characters that are incompatible with some operating systems.
Starting with Tonido Sync Build 18199 : Files with these characters are not synced.
Please rename them to something more suitable for use across multiple operating systems.
The following file names are also not synchronized
Long Filenames or Paths
Windows Operating Systems only allows files and folder names of around 260 characters or less. So paths longer than those are not synced.