This is crucial. Rename the .srt subtitle file exactly the same as your video file. For example:
උපසිරැසි භාවිතා කරන්නේ කෙසේද? sinhala subtitle movieolympus has fallen
මයික් බෑනින්ගේ චරිතය හරහා වීරත්වය සහ කැපවීම මැනවින් විදහා දක්වයි. සමාප්තිය This is crucial
While not exclusively Sinhala, platforms like (archived) and OpenSubtitles allow user uploads. Use filters to restrict language to "Sinhala" or "Sinhalese." Be sure to check the upload date; newer uploads often fix sync issues that plague older files. sinhala subtitle movieolympus has fallen