Hello there. I really like the Affinity suite of apps. I have one issue though - it doesn't make use of the native and very useful auto saving functionality that is present in many apps on macOS. Apps such as Pages, Numbers, Keynote, and Sketch (the UI design program) include this functionality and it is very useful because it allows the document to save by itself and also provides native version history, in a Time Machine-like format. Please consider adding this feature in the future.
More information: https://developer.apple.com/design/human-interface-guidelines/macos/system-capabilities/auto-save/