New-media writing exerts pressure in ways that writing instruction typically has not. In this article, we map the infrastructural dynamics that support--or disrupt--new-media writing instruction, drawing from a multimedia writing course taught at our institution. An infrastructural framework provides a robust tool for writing teachers to navigate and negotiate the institutional complexities that shape new-media writing and offers composers a path through which to navigate the systems within and across which they work. Further, an infrastructural framework focused on the when of new-media composing creates space for reflection and change within institutional structures and networks.