Upload File Button?

Hello!
I am exploring creating a digital check request form to replace our current paper version.
We need a way to attach images of receipts etc. to a form so that everything stays organized and together. (versus filling out a PDF form and attaching it to an email to submit and then also adding several image attachments (of receipts).

Is there a way to create an "Upload File" button that would allow the viewer to upload images that would either travel with the PDF or be saved to a cloud location?

If so, give it to me in layman's terms. 🙂
If not, any suggestions for a Plan B?
Thanks so much for taking the time to read this.