How can I know the features of an email attachment

How can I know the features of an email attachment

Firstly, your form should contain a File Upload field element which will enable your users to upload any document/image via the form.

Files uploaded by your users using the File upload field in your form appears as hyperlinks in your form submission. You have the option to view them as attachments when you receive the notification email after a form is submitted.

This is what the link explains. This attachment would be in any format such as .doc, .docx, .pdf, .jpg or any other format that your user attaches to the form.