Ask students to download Microsoft Office Lens. This app is designed to take clear photos of whiteboards and documents, and can save information as PDF, Word or image files. It can also insert images directly into Onenote documents and upload saved documents on Onedrive, for easy access on Office 365.
It is available on Android and iOS phones, as well as for Windows laptops.
https://play.google.com/store/apps/details?id=com.microsoft.office.officelens&hl=en_US
https://apps.apple.com/us/app/microsoft-office-lens-pdf-scan/id975925059
https://www.microsoft.com/en-us/p/office-lens/9wzdncrfj3t8