The BEST choice for sharing the file MOST efficiently would be email.
Email allows Dylan to send the file directly to his uncle's inbox, ensuring that he has easy access to it without needing to navigate complicated cloud storage platforms or social media. Additionally, email is a familiar tool for many people, including those who may not be well-versed in technology, making it a user-friendly option for sharing files. Physical copies may be less efficient due to the time and effort involved in printing and delivering the file.