Nomadesk is not able to synchronize files with filenames containing invalid characters.
On the Windows platform there are a couple of characters which aren't allowed in filenames. E.g. the following characters are not allowed:
\ / : * ? " < > | and also spaces behind foldernames / filenames
Windows aso has a specific set of restricted filenames. The following file names are invalid:
CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9. Also avoid these names followed immediately by an extension; for example, NUL.txt does not work.
For more details, see the Microsoft information here: https://msdn.microsoft.com/en-us/library/aa365247.aspx