Problem with file name PDF

Hi,

I have one problem with file name for generated PDF doc from Dolibarr.

Etc. for invoice i was make to create name like this ФК-001/2019, ФК is Cyrillic characters, Macedonian.

The problem is when i try to download the PDF doc, in file name is missing ФК. The problem is active and on attach file in email.

I was tried to change from Cyrillic to lattin characters and problem was fixed, but i must use Cyrillic characters…

Here is the image from problem.

Best Regards,
Martin

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