In this paper, we delve into the experiences of 60 English as a Second Language (ESL) undergraduate learners who actively participated in distinct multimodal instructional units within their writing curriculum. Drawing upon a qualitative analysis encompassing design interviews, written reflections, and video observations, this research elucidates the principal themes that emerged from the learners' perspectives related to the potential of Digital Multimodal Composition (DMC) in the ESL context. These themes encompassed the exceptional opportunities afforded by this approach, which included the capacity to conceptualise ideas through the incorporation of visuals and auditory elements, the ability to communicate in novel and inventive manners, the platform it provided for the authentic expression of personal identities, and its effectiveness in the contextualising topic within their learning journey. Furthermore, this research highlights the primary challenges and constraints voiced by the learners, which encompassed a gamut of technical issues and the quest for the most suitable mode of expression within the multimodal framework. Leveraging these insights, the study culminates in a discussion of implications for both research and practice, particularly about the integration of digital multimodal composition in the multilingual classroom setting.