Surface youtube_video_id on Google Video-campaign ad creative (parity with PMax asset-groups)

For Google Ads Video campaigns, please include the YouTube video reference on the ad's creative in /v1/ads/tree and /v1/ads/{adId} — the same youtube_video_id that asset-groups already returns as a YOUTUBE_VIDEO asset.

Why it should be small:

• Support confirmed the YOUTUBE_VIDEO asset type and the youtube_video_id GAQL field are already in the Google reader.

• Today they're only reachable through asset_group_asset, which exists on PMax only.

• Non-PMax per-ad sync maps text creative only (googleHeadline / googleDescription), by design — so Video campaigns return no media reference at all.

What we measured (90 days):

• Campaign 23896913891, Google ad account 5103020293, ad group 200120326714, 26 ads.

• creative.mediaUrls is an empty array on all 26; no video field anywhere in the payload.

• The videos do exist on Google's side — they're listed under Assets › Videos for this account, and the ad preview gallery serves them (youtube.com/watch?v=VSCkrvtVt3Y).

Paths we checked, all dead ends for Google media outside PMax:

• /v1/ads/{adId}/media → 501 feature_not_available

• /v1/ads/campaigns/{id}/assets and /v1/ads/ad-sets/{id}/assets → only sitelinks, callouts, structuredSnippets

• /v1/ads/videos, /v1/ads/images, /v1/ads/creatives → 400 "adAccountId must be act_<n>" (Meta-only)

• /v1/ads/campaigns/{id}/asset-groups → works, but 0 groups for a Video campaign

Impact: Video campaigns render with no creative at all on our dashboard, while PMax in the same account shows images fine (4 campaigns → 81 asset groups, 3,233 assets, 621 images

with imageUrl, 311 YOUTUBE_VIDEO).

Also useful if cheap, but not blocking: the same for Display/Demand Gen image assets, and an account-level Google asset-library read endpoint.