Find Scanned Documents

Depending on what those documents were and what you did

to Scan them, the process of answering your question is hard.

The iPhone User Guide has a Table of Contents, this may be

useful to locate that topic (& other related topics separately)

Or just search the guide ~ basically and hope you get lucky here..

This never works for me; also posting replies at times is hard.

iPhone User Guide (Table of Contents) - Apple Support

//support.apple.com/guide/iphone/toc

In above guide, are references to QR codes, Notes; among other Scans.

Scan text and documents in Notes ~ using the iPhone camera - Apple Support

You may need to take some time to discover what/all the iPhone does here.

See this user tip.

Writing an effective Apple Support Communities question