Hello,
The mime types must be natively renderable and playable on a platform to be supported (IMA will only select the mime types that are compatible with the requesting platform). Currently, native mobile platforms (Android and iOS) do not support Flash and JS VPAID ads, so IMA will either select another mime type or throw an error here.
For the full list of compatible ad types per platform, please check our
compatibility matrix. Also note that the video player that is used must also support the selected mime type. The IMA SDK only selects the creatives - playback is left to the video player.
Vu Chau
IMA SDK Team