いつも素晴らしい動画をありがとう！って英語でなんて言うの？

In order to tell someone that they always post great videos on YouTube, you can say:
Thanks for always posting great videos!

To post
- This means to submit something on social media like a photo or video clip.
Video
- motion picture.

You can also say:
You always post such great videos!
I love your videos!

Both of these phrases show great appreciation for the videos that the person has posted.

I hope that helps!

The three sentences you see above are great ways to thank someone for posting great videos. In the second sentence you will see the word content, which means subject matter or theme. In the third sentence you will see the expression get a kick out of, which means to enjoy. This word and this expression are common in our everyday conversation and would be a great addition to your vocabulary!

When you want to compliment your favorite YouTuber about putting up great content, you can say:
-Thank you so much for your great videos. I love them.
-I enjoy all your videos. Great work
-Thanks for the great content. I really enjoy your videos.

I am one of your subbies on YouTube and I really enjoy your videos.
If you are a subbie on YouTube it means that you have subscribed on their YouTube channels and you are always watching their videos.

Thank yo for posting great videos on Youtube.
This is a direct way of thanking them on posting great videos on YouTube.

To kick ass = Extremely good or impressive; excellent, outstanding.
‘I will be a kick-ass management coach.’
‘That song is totally kick-ass.’
Context example:
"I'll be uploading a new video every week during my trip around Chile."
"Wow, that's great news! I just love your videos on this site!"

"Your posts are always very good "
 I love watching your posts, your videoes are really good
or
 Thanks for the interesting content
or
Thanks for posting such good videoes