Also to the point of Video App Cards, it does not seem possible currently to create a Video App Card to promote a tweet with video without actually using App IDs, making their purpose even more confusing.
We will post more details, but in our recent trials with the workflow outlined here https://dev.twitter.com/ads/creative/promoted-video-overview we have had little success: it appears from this document that Twitter intends to overload the purpose of a Video App Card to include both App Installs and Video Views, and that the recent change of the PUT /video_app_cards documentation https://dev.twitter.com/ads/reference/put/accounts/%3Aaccount_id/cards/video_app_download/%3Aid (the app_ids sections were changed from “Sometimes Required” to “Optional”, indicating these would work for either purpose) would support that.
In actual usage, it’s not possible to create a Video App Card without app_ids:
Your request (POST https://ads-api.twitter.com/0/accounts/abcd1234/cards/video_app_download) resulted in the following errors: MISSING_PARAMETER: Please provide at least one of the app ids.
Are Video App Cards intended to be used to drive Video Views campaigns in addition to App Install campaigns, or is it just an App Installs card that contains video?