Final answer:
Morgan's activity of preparing digital files for printing is called prepress, which includes proofing, corrections, and ensuring file compatibility for quality printing.
Step-by-step explanation:
The activity that Morgan is performing while preparing digital files to be sent to a printer is known as prepress. Prepress is the term used to describe the process of getting a document ready for print production. This includes tasks such as proofing, making corrections, finalizing the layout, choosing the correct file formats, and ensuring that all elements like images and fonts will print correctly. Prepress activities are essential for avoiding costly mistakes and ensuring that the printed material meets the desired quality standards.