Open the PDF on your iPhone
Tap the Share button
Select Save to Files
Choose a folder in iCloud Drive or On My iPhone
Tap Save
To save from Mail or Messages, open the PDF attachment first
Tap the Share button
Select Save to Files
Choose a location
Tap Save
To save from Safari, open the PDF
Tap the Share button
Select Save to Files
Choose a folder
Tap Save
To save to Books, tap the Share button
Select Books
Open the Books app to access it
To save a PDF image or webpage, use Share
Select Print
Pinch out on the preview
Tap the Share button again
Select Save to Files
Choose a folder
Tap Save
