In this article, a co-creation experience based on research-design in multimodal literacy is presented. This research aimed to document the multimodal and digital practices of students in the context of documentary research or artistic creation. Secondary II students, in history class, took part of this innovative co-creation project combining multimodal reading (reception) and writing (production). The co-created project, a digital historical atlas, takes the form of a multimodal portfolio, as students grouped their learning in different ways: timelines, images, texts, maps, etc. In this article, which takes the form of a documentation of practices, we present the historical atlas project according to the 4P approach (portrait of the environment, process of co-creation, project, production). Finally, the main findings emerging from the co-creation experience and from the experimentation of the co-created project in class are presented.