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Required scopes: marketing_templates_write
required
When url stops accepting the file.
String!
required
Pass as source.uploadId to uploadMarketingImage once the file is uploaded.
String!
required
Where to PUT the file’s raw bytes, e.g. curl --fail -X PUT --upload-file ./image.png "<url>". No other headers are needed; curl sends the Content-Length the URL was signed for.