You may not know it, but you all have a secret scanner in your iPhone, iPad, and iPod touch, which allows you to scan and submit documents without the need for a third-party application.
A way to sign a document is also available - Bioinformatics India Read more; https://www.bioinformaticsindia.com/tech/mobile/how-to-scan-your-documents-using-your-iphone-ipad-or-ipod-touch/30972/