VAST-2.0-mediafile-delivery
<MediaFile> must have a delivery attribute
ErrorRequired fieldsIAB VAST 2.0 §2.4.1VAST 2.0 and later (all versions)
Every `<MediaFile>` must declare how it is delivered via the `delivery` attribute. The valid values are `progressive` (HTTP download) and `streaming` (live stream protocol such as HLS/DASH).
How to fix
Add delivery="progressive" for HTTP-served files (MP4, WebM) or delivery="streaming" for live protocols (HLS, DASH).
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