Change Recording Settings Retroactively?

Welcome to the Zoom Community, @AmandaStone.

Well, you CAN change the recording settings at any time, but those changes will not affect any recordings already done.  The Zoom recording technology builds the recording stream into a single, complex file during the recording process based on the recording settings, and then -- as you probably know -- processes that file into the separate recording files that you are able to access after the session.

Also note that different recording outputs are available when recording to the Zoom Cloud; the recording outputs from a Local recording are limited.  I find it very helpful to experiment in advance of any important event to ensure you're going to get what you think your settings will create for you.