The approximate size of your Vv is indicated by a "heat scale" at the top of the "Scenes" tab. While the recommended size of a Vv is around 30 MB - roughly the size of an MP3 music album - Vvs are supported up to a maximum of 80MB. For the best download performance for your collaborators, try to keep your Vv size out of the red end of the scale. Vvs over 80MB cannot be published.
We have also observed that sometimes the best stories are told with the fewest words. Or put another way, when trying to get crisp and timely feedback, it is best to share smaller, more targeted Vvs that help collaborators stay focused on the key messages.