Hi Marisa!
We're working on a new add/edit page for asset currently. It will be presented in a modal dialog which means a pop up, where you will have to purposely save changes or discard changes. When that comes out you'll no longer be able to navigate away until you purposely choose to save or discard changes. While that's not quite the same as autosave as you go, it should alleviate some of scenarios in which you can potentially lose your changes by navigating away.
Let me know if this helps. That new page should be coming this some time this summer.
Thanks,
Mandy Bank
Product Analyst D360 Govern