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This study investigated how students designed English academic oral presentations via a blended language learning environment. Data were collected from focus group interviews, observations of students, and instructor perspectives to explore how students develop academic presentation skills. In addition, a total of 36 oral presentations were assessed by a rubric and frequency counts of presentation language and features. By adopting an ecological approach, we identified the interactions between different factors that influenced learning. Interview findings and observations suggested students welcomed the immediacy of the technology and demonstrated signs of autonomous learning by self‐selecting the chat application Line for group collaboration. Participants preferred both online and face‐to‐face collaboration, as students discovered the limits of online communication. Results indicated that group oral presentations improved, with stronger introductions, linking devices, and visual elements. However, students had problems constructing conclusions and trouble linking the main ideas to the content. Lay Description: What is already known about this topic? Group oral presentation projects train students in 21st century competencies such as multimedia skills, critical thinking, problem solving, and collaboration.Cloud computing collaborative environments have the potential to help students develop language and communication skills.Users are aware of some of the affordances of mobile devices for language learning. What this paper adds? A description of the design and development of a blended language learning environment (BLLE) for English undergraduate oral presentations.Identified improvements in oral presentation introductions, cohesion, and visual elements from using this BLLE.Provides deep, qualitative insights on student perspectives for collaborative, mobile‐based learning from an ecological approach. Implications for practice and/or policy Oral presentation skills can be developed in a BLLE providing the instructor involves students in the design process.Instructors need to discover the right blend for language learners between online and face‐to‐face collaboration to facilitate project development.Collaboration, instruction, effective learning technology, and convenience are the four main factors that interact and influence how students develop and perform group oral presentations in a BLLE. [ABSTRACT FROM AUTHOR]