Can we add image and PDF attachments to our form?

Am I able to attach download/upload file images, pdf's, etc?

While you can not attach the same to your form, you can upload them to your server and show them on your forms.

For images, there is Image field that will show it for you and allow you to upload the same to your form

For PDFs you would need to use the widget such as: PDF Embedder or PDF Previews and you can add them to your form by following these steps: How to Add a Widget to your Form