Here’s how to do so.
On your iPhone, tapFiles.
Open a PDF file.

From the left edge of your iPhone, swipe to the right to see the thumbnail page view.
Press and hold on a page to bring up the edit menu.
Choose to rotate the file, insert pages from files, or scan new pages in.

Can You Edit Files on iPhone?
In conjunction with the new PDF features, it’s possible to edit a PDF using the Markup tools.
Here’s how to add a blank page, fill out a form, and more.
TapText, SignatureorMagnifierto add one of the features to your PDF document.
What Can and Cant I Do With PDFs Using iOS 15?
Here’s what you’re free to and can’t do using the Files app.
Open theNotes appand create a new note, then initiate the Camera app and tapScan Documents.
Hold the camera over the document to automaticallyscan the document with your phone.
You canchoose where to save iOS downloadsin Safari or Mail.