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It looks like you want to have upload field in your form where your campers should be able to upload their health form in addition to other registration details. Is that correct?
Yes you can achieve this requirement. You can add "File upload" questions from the "Form Tools" tab:
Adding a file upload question will allow you to select one/multiple file and upload them. You may also like to check the following guide on how to change the upload size limits:
Hope this helps.
Do get back to us if you have any questions.