Using Customized forms to Update a Dataset

im trying to figure out if it is possible to use customized Forms to update existing datasets.

My Aim is to create a custom Form that can be used to collect data in multiple steps iteratively. As far as i can see it is only possible to create an one-shot submit.

any ideas how to solve this?

I think I am trying to do something similar. I have a series of forms connected using the Redirect to URL option.

But each form puts the data in a new row. There is an instruction to

Use {row_id} to include the newly created row id in the URL.

I thought that might keep the responses in the same row. But so far I haven’t been able to get it to work. I get a form not found message.

However, it doesn’t give more instructions than that. I have tried adding {row_id} and {row_1} to the end of the URL and it