How it works
1
Switch your form to update mode
First, choose 
Then specify that you want to 
Notion
in the Integrate page.
Update page
.
2
Use a formula to specify the page to update
You’ll now get a formula in Fillout that defines a unique link for every page in your table. Create a new 
Adding a formula property is mostly for your convenience. If you already know the page ID of the page that you want to update, you can pass it into the URL yourself!
formula
property in Notion and copy the formula provided by Fillout.
Note: If you don’t provide an id in the unique URL, the form will create a new page instead.
3
Preview your form
That’s it! Click 
Finish setup
. Preview your form or use a unique link to update a page. The form auto-fills for the page it’s updating, and you can select the Record to update in the top left.
Note: In Notion, the formulas with the links to update the records are most easily clickable when using a Table view.