Both Vimeo and YouTube do not allow you to add your own PreRoll Ad. If you have your own video, then there is only the solution to host the video yourself and then integrate the PreRoll-Ad.
Can I integrate a preroll into Vimeo and YouTube?
Both Vimeo and YouTube do not allow you to add your own PreRoll Ad. If you have your own video, then there is only the solution to host the video yourself and then integrate the PreRoll-Ad.