The asset formats required for delivery today vary across platforms. How can I organize them to avoid rework?

I wrapped up an event project today, and the client needed a website banner, Instagram reel cover, email header, and venue screen graphics all at once. Previously, designers would export based on chat history, which made it easy to miss dimensions. This time, I created a deliverable matrix first: platform, dimensions, file format, naming convention, deadline, and approver, and had the client…