AFAIK there are no restrictions through Roon. All restrictions should stem from the OS and the underlying disk format / file sharing technology used. Depending on that, there might be restrictions on file or folder name length as well as total path length.
@BlackJack is correct — Any limitation here would stem from the OS. Can you describe your setup? What is your Core machine? Where are the files stored?
Windows has a folder path limit of 260 characters (257 after drive letter); this can be changed in Windows 10 but I think a registry edit is needed. It’s 1024 for Macs and 4096 in Linux. This includes drive+path+filename.
I have my music stored on a QNAP nas.
Roon is running on a NUC ( Ropioo)
My music is in a folder named:
" Een deel van de Basis muziek bestanden omgezet naar WAV en DSD"
There’s no problem what so ever to connect to this folder via my MAC or the filestation software embedded in QNAP.
Somehow the length of the folder name is to long ?.
When I reduce it to " Basis muziek bestanden omgezet naar WAV en DSD" all works fine again
This is the folder on the QNAP as my Mac sees it
below the a snapshot of roon looking at this same folder but not doing anything
If I reduce the length of the folder then it’s ok
\\192.168.10.20\Muziek\Roon Ready\Deel van de Basis muziek bestanden omgezet naar WAV en DSD\01 - Verzamel albums+ losse Nummers+ klassiek\Klassiek\Donald Runnicles Atlanta Sympho…Orff Carmina Burana - Eigen SACD\
This are already 214 characters and we’re not down to a file yet. There might also be some missing characters in the place where the … (ellipsis character) is.