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This is possible, you can import submissions to your existing form from an Excel file, here is how: https://www.jotform.com/help/308-Import-App-Easily-import-your-Excel-or-CSV-data-into-JotForm
Let us know if you need more help, we will be glad to assist you.
Actually, maybe I meant something different:
Is it possible for an enduser (without JotForm login) to upload a spreadsheet containing data (for example; name, address, e-mail ) that is saved directly to the submissions?
I want to use the form as a registration, where schools can upload a file containing students registration. (This instead of entering each student one by one)
Unfortunately it is not possible to import submission without Jotform Login. But the owner of the form can import submissions from excel or csv file according to the below guide:
If you have any query or need further assistance, feel free to revert back.