How do I turn on the scanner option in notes
How do I turn on the scanner option in notes on iPhone
iPhone XS Max, iOS 13
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This support article tells you how to scan into Notes.
You can also tap the 3 dots in the upper right and tap Scan.
How to scan documents on your iPhone, iPad, or iPod touch - Apple Support
I believe you also need to be using an iCloud Note. ie, you cannot do this in a gmail synced Note
If your details are correct and you are using iOS 13, you should update to iOS 14.