Instagram Reels Custom Cover Image

Would love the ability to set a custom cover image for Instagram Reels—similar to how YouTube thumbnails already work via mediaItems[].thumbnail.url.

Why this matters:

• Keeps branding consistent across platforms

• Better click-through with a designed thumbnail vs. random frame

• I already have YouTube thumbnails made—let me reuse them when cross-posting!

Suggested API Parameter:

json

{  "platforms": [{  "platform": "instagram",  "platformSpecificData": {  "cover_url": "https://example.com/thumbnail.jpg"  }  }] }

Or via instagramSettings:

json

{  "instagramSettings": {  "cover_url": "https://example.com/thumbnail.jpg"  } }

FYI: Instagram's Content Publishing API already supports cover_url for Reels, so this should be doable on your end.