workflow_start.cs

[FunctionName("ApproveFile_Start")]
public static async Task HttpStart(
    [BlobTrigger("files/{id}", Connection = "StorageAccountConnectionString")] Stream fileBlob,
    string id,
    [Table("metadata", "{id}", "{id}", Connection = "TableConnectionString")] FileMetadata metadata,
    [Table("metadata", Connection = "TableConnectionString")] CloudTable metadataTable,
    [DurableClient] IDurableOrchestrationClient starter,
    ILogger log)
{
    // ...
}