How can I make changes to a flow without "publishing" it?

[AIUYM19]

I use a lot of flows to perform various functions within a PowerApp. In PowerApps, I can work on changes, but not publish them, so the users of the app can still use the unmodified "published" version of the app. Sometimes, these PowerApp changes require a change to one or more flows. Often, changing the flows will break the currently published version of the PowerApp. Is there a way to work on (and save) changes to a flow over a few days while still allowing users of the PowerApp to use the previous version of the flow?

The only alternative I've found is to take down the PowerApp for several days while I make the necessary modifications and republish. But this is often not possible, since my app has many users who need access to it frequently.