A system and method is described for enabling a user to add extensions to one or more of the preconfigured workflows for processing media content. The extensions can comprise a custom task that is injected at a specified entry point in the preconfigured workflow, such as after completion of a particular task. The custom task injected into the workflow can perform a variety of processing jobs, such as adding digital rights management (DRM), allowing access to the media content by third parties, injecting advertisements or other content into the media, checking the media content for errors or viruses, and the like. The custom task may also instruct the workflow to delegate access to the media content to external third party services. When the preconfigured workflow reaches the specified entry point, the workflow may be suspended until the custom task is completed, at which point the preconfigured workflow may resume.