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
You create a file with a date stamp to organize your files. E.g. on the Mac OS, you will have a file named "09/03/2009 Status Meeting.docx". When you try to access the fileserver to check out the meeting report on your Windows pc, you will find that it is impossible to download the file because of the "/" characters.
The solution is to rename the file via the conflicthandler on the Windows PC or rename the file on the device that uploaded the file.