If your post is meant to help someone struggling to watch the file, focus on technical fixes. MKV files often have issues with "crushed blacks" or heavy shadows when converted.
Check if the service is causing system slowdowns when opening large MKV files.
Ensure the file isn't using a high-tier Dolby Vision profile that their hardware can't handle.
Conversion from MKV to other formats (like .MOV) can sometimes make shadows appear too dark .
Knowing if it's for a car community (like the Shadow Blue MKV Golf), a tech support thread, or a film edit would help me tailor the post perfectly for you. Make your SHADOWS come to LIFE in Premiere Pro