# CreateStandaloneAdRequestPlacementAssets
## Properties
**default_image_url** | **String** | Catch-all image for any placement not matched by a rule. REQUIRED — Meta mandates a default asset customization rule (empty placement spec, lowest priority) on every placement-customized creative. |
**rules** | [**Vec<models::CreateStandaloneAdRequestPlacementAssetsRulesInner>**](CreateStandaloneAdRequestPlacementAssetsRulesInner.md) | One entry per placement group you want to pin a specific image to. |
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