Adding to library files with polish diacritic signs

Hello,
I have a problem with my Serviio. On 1.4.1 there was no problem.
When I've updated to 1.5.2 files with polish diacritic signs in their names are not adding automaticly to library.

Polish diacritic signs are ą ć ę ł ń ó ś ź ż.

Maybe someone culd help me with that?

thanks a lot and sorry for my english

Rafał

[zip]

What OS?

This is NAS Zyxell NSA 325v2
But I don't think it matter because on 1.4.1 on this OS there is no problem. All files were added to library without rename.

Wysłane z mojego Nexus 4 przy użyciu Tapatalka

I wonder if this is related. Looks like a solution in the thread here: UTF-8 support on FFP 0.7 NAS Zyxel NSA325

Thanks