I'm not sure if this is an actual trailer or not, and although it says it can go HD, even at the highest quality the video was still kind of blurry to me. So, I don't know if you want to use it or not.

Drama: https://mydramalist.com/9867-jam-loey-rak 

Trailer (Eng): https://www.youtube.com/watch?v=7kKZIKraOS8 

Drama: https://mydramalist.com/30568-history3-miracle 

Trailer (VIKI): https://www.youtube.com/watch?v=yd0aWXKOBXw

There is already a trailer for this drama on MDL, but it doesn't have subs. This trailer has hardcoded subs and it's from an official source. 

Also, you should add VIKI's channel (https://www.youtube.com/channel/UCqra4Lzndm4H0LB-zwOqbxQ ) to the list of "Trailer channels on Youtube" in the first page of this section.

movie : https://mydramalist.com/33229-innocence

trailer : https://youtu.be/vjw9Rp57tGA