A signed upload parameter for uploading an asset to Shopify.
Deprecated in favor of
[StagedUploadParameter](https://shopify.dev/api/admin-graphql/latest/objects/StagedUploadParameter),
which is used in
[StagedMediaUploadTarget](https://shopify.dev/api/admin-graphql/latest/objects/StagedMediaUploadTarget)
and returned by the
[stagedUploadsCreate mutation](https://shopify.dev/api/admin-graphql/latest/mutations/stagedUploadsCreate).