Hello,
If I understand you correctly, you are trying to build a wizard (step wise forms) and can try the following:
- When the user clicks on next, you need to commit the object / changes → so now they are in the database with help of a custom microflow if you need to also add validations etc.
- When the users clicks backs, you want to load the saved form / object → so again use a custom microflow for this if you need additional checks before loading the page.
Hope this helps!