Microsoft OneDrive - Scan a Document in OneDrive app

Open OneDrive App on your mobile device.
Click the blue Plus (+) icon at the bottom.
Choose Scan.
Place camera over the item you want to scan. On the right, you can select Document, Whiteboard, Business Card, or Photo mode. Tap the white capture button.
You can adjust the border of your document or use other editing options (such as Crop, Rotate, and Delete). Tap Review and Edit when ready.
You'll return to the camera, where you can either add more pages, or continue to the upload.
Before uploading, you'll be able to finalize details such as the filename and save location. Tap the blue Save button to complete the upload.