value type: object

The S3UploadButton block allows a user to to upload a file to AWS S3.

The s3PostPolicyRequestId property is required, and should be the id of a AwsS3PresignedPostPolicy request. This request is called by the block when the user uploads a file, to create a policy that allows a file to be uploaded to AWS S3.

The block has an object value in state, with a file key, which has an object corresponding to the last uploaded file, and a fileList array with objects for each the files.