Thumbnail: https://files.catbox.moe/tmbwq4.jpg
original video description: https://files.catbox.moe/546zrg.txt

Completing the file:
Attach thumbnail:
AtomicParsley.exe .\video.mp4 --artwork .\thumbnail.jpg

if the command above fails due to an error like
AtomicParsley error: bad mpeg4 file (ftyp atom missing or alignment error)
it is because youtube-dl fucked up (why does she have to do ara ara at the very end of the stream...)
fix it with this command:
ffmpeg -i originalvideo.mp4 -c:a copy -c:v copy fixedvideo.mp4

Add to description to the video's comment:
Right click video,
select properties,
click details,
double click comments' value,
fill with content of original video description txt