How to fill form's initial data property

Dear Retool-specialists,

I can´t find the initial data property of a form. I would be happy for any hint.

Can you post screenshots? Are you loading a form from a data set? Or something like a selected row in a table?

I have inserted a table (legacy). The datasource is a query. Then I have inserted a form and genereated it with the inserted table.

For adding a new record I would like to fill automaticly the id. To insert the math function I need to set the initial data property. Unfortunately I can´t find it.

You want to submit the form?
Try using {{}}
And check the state:

Thank you for the answer. By checking the state I found the property initialData but I did not get how to set it.

I solved the problem by folowing this instruction: