YT to Tumblr Video Post
If
New public video uploaded by you
This Trigger fires every time you upload a new public video to YouTube.
Then
Create a video post
This Action will create a video post on your Tumblr blog from the given URL to a YouTube video, a Vimeo video, a URL to a video file, or an embed code.
Explore more great ways to automate YouTube and Tumblr (legacy)