Subtitles embedded and .srt file

I have downloaded the .srt files needed and place the video and the .srt file in the same folder but I can still can only select the embedded English subtitles and not the Spanish .srt file. What am I doing incorrectly?

Thx,

Hi Mark_Knight

Maybe you should try contacting WD’s Technical Support about this.

To Contact WD for Technical Support
https://support.wdc.com/support/case.aspx?lang=en
The link below will allow you to call support.

Thank you Brandon. I sent them a message.