Best pratice to upload a digitized document?

our website will provide a variety of forms where users will need to upload documents.

User surveys have shown that many users have problems digitizing and uploading paper documents. For example, very few users have a scanner.

One scenario is: The user fills out the form on his desktop computer. The user photographs the document with his smartphone and sends it to himself by e-mail. On the desktop PC, the user opens the e-mail and downloads the image. Finally, the user uploads the image in the form.

do you know best practices how it can be simplified for users with a desktop pc?

an idea for users with desktop pc: In the form next to the upload field, a personalized link and a qr-code are also offered. If the user opens this link with his smartphone, he can take a picture and upload the file. as soon as the file is uploaded, the uploaded file is displayed in the form on the desktop pc. The user can continue to fill out and send the form on his desktop pc.