A single operation to create an asset. Supported asset types are YoutubeVideoAsset, MediaBundleAsset, ImageAsset, LeadFormAsset, LocationAsset, and ImageAsset. TextAsset can be created with an Ad inline, but it can also be created apart from an Ad like other assets.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/services/asset_service.proto)

| Fields ||
|---|---|
| ## `operation` Union field. The mutate operation. `operation` can be only one of the following: ||
| ### `create` | `https://developers.google.com/google-ads/api/reference/rpc/v25/Asset` Create operation: No resource name is expected for the new asset. |
| ### `update` | `https://developers.google.com/google-ads/api/reference/rpc/v25/Asset` Update operation: The asset is expected to have a valid resource name in this format: `customers/{customer_id}/assets/{asset_id}` |
| ## `update_mask` | `https://protobuf.dev/reference/protobuf/google.protobuf#field-mask` FieldMask that determines which resource fields are modified in an update. |