Can the applicant upload documents with Jotform?

Yes, you simply need to add the File Upload field to your form.

Please read these related guides:

https://www.jotform.com/help/33-Changing-the-upload-size-limit 

https://www.jotform.com/help/29-Which-file-types-are-allowed-for-the-upload-field 

Let us know if you need more help, we will be glad to assist you.