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You just need to activate the "Allow Multiple" option in the File Upload in order to allow users to upload multiple files. Here's a guide:
1. Drag File Upload field to your form.
2. Then click the Allow Multiple button.
3. Here's the result:
Note: You might want also to change your Max File Size, here's a guide on How to change the upload size limit.
You can check this guide as well if you want to limit the file types allowed to be uploaded in your form. Please check this guide: https://www.jotform.com/help/29-Which-file-types-are-allowed-for-the-upload-field
Hope this helps. Let us know if you need further assistance. Thank you!