How to collect multiple records on a single form?

How can I provide people a link to go back in and edit their submission?

Is there a way to do a student registration where someone needs to provide information for 25 or 50 students and they can put it in Excel and upload it into Jot Form. Is there a way to build the form so they can click to add more students? Some may have 30 students, some 23, some 75.

OK, it's not possible to just import an Excel file and then have the list showing up on your form, if you would like to allow users to upload the list, then the only option is to use an file upload field, here is a guide with more details about it: https://www.jotform.com/help/332-How-to-Create-File-Upload-Forms 

However, once the file is uploaded it cannot be edited, so if you need to add more records you need to either re-upload the file with the new records or do the following: 

- You may add a configurable list to accept multiple records so they can add as many records as they need, here is a guide that will help you with that: https://www.jotform.com/help/282-How-to-Set-Up-the-Configurable-List-Widget 

How can I provide people a link to go back in and edit their submission?

It seems like you already opened another thread for this, we will assist you regarding this matter here: https://www.jotform.com/answers/1863528 

Please kindly follow up this matter on that thread only for easy follow up.

Thanks.