Subtitles: External vs. Embedded

Hello everyone.

Serviio ver. 1.4.1,
TV Samsung UE65HU8500RU (native support for .ass subtitles)

Trouble with subtitles: .mkv has embedded english subtitles and also has an external russian subtitles in .ass format, but shown only embedded english.
Preferred langusage in Serviio Console is set to ru,rus,russian.
In Serviio support page mentioned: In the case a video has both, a matching external subtitle file as well as a matching embedded track, the external file has priority. But it doesn't.

How to fix? Thank you.
* sorry for my english

[zip]

what are the file names? video and .ass file.

No need to give the preferred language in the console, unless your subtitle file includes the language code in the file name.

Free - 01.mkv
Free - 01.ass

[zip]

did you try to remove the preferred language in the console?