If you have your own video files and need to add external subtitle files (usually in .srt format), these communities are the primary sources:
Frequently available on streaming sites and through physical media like the Season 1 DVD. Halt and Catch Fire(2014)199 Available subtitles
Click the "CC" or speech bubble icon directly in the video player during playback; it often defaults to "Off". If you have your own video files and
Availability varies by region, but it generally supports high-quality subtitles for its 1080p and 4K tiers. How to Enable Subtitles on Your Device Halt and Catch Fire(2014)199 Available subtitles