A single operation (create, update, remove) on a campaign asset.
| Fields | |
|---|---|
| 
 | FieldMask that determines which resource fields are modified in an update. | 
| Union field 
 | |
| 
 | Create operation: No resource name is expected for the new campaign asset. | 
| 
 | Update operation: The campaign asset is expected to have a valid resource name. | 
| 
 | 
 Remove operation: A resource name for the removed campaign asset is expected, in this format: 
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