Name the attachment cover.jpg or small_cover.jpg for best compatibility with players.
: Windows File Explorer does not natively display embedded MKV thumbnails. You can use Icaros to enable thumbnail previews for MKV cover art. Download File ThaiHauCheonChu_13.mkv
Click to save the new version of the file. Name the attachment cover
Open and add your ThaiHauCheonChu_13.mkv file. Go to the Attachments tab. Download File ThaiHauCheonChu_13.mkv