In addition to the file, metadata will be posted to the api. The following keys may optionally be passed: brandId, sourceId. The brandId parameter is an id generated by FieldView and supplied to the partner. This will allow the FieldView apps to style and brand content from the partner correctly. The sourceId is an optional parameter which the partner may supply, which represents the unique identifier, of the asset, in the partner’s system.
Metadata tags should be supported in a mechanism similar to the one provided in the POST v4/uploads/ API as documented in the Parameters section in the technical documentation.