How to Link 2 forms submitted by the same user

Design help General
1

Hello, I would like to build a email sign-up form where users can type their email addresses and once the form has been submitted a modal will pop-up. Inside this modal I was planning to ask users some feedback with a check select field with different options.

  1. User input email address
  2. 1st form is submitted
  3. User can decide to offer additional feedback selecting one of a few options on a modal
  4. 2nd form is submitted

Is there any way I can then link the two forms submitted? I would like to keep record of email address and feedback together.

Hope you can help me.

Thank you