Our OTTfeed.com platform supports custom Ad breaks, and you can import your videos metadata from Vimeo pro account. Take a look at https://OTTfeed.com and let me know if you have any questions.
Which ad server are you using?
On SpotX page you will find "Example of a properly formatted and complete connected TV ad request to SpotX":
@lidepeng139 try to ad this string to the end of your feed