Upgrading And transferring data

Hi 2WanderingKs,

Thanks for coming to Apple Support Communities for help today moving your iPhone 6 data to an iPhone 8. I can point you to an article with three different methods.

Have a look here: Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch.

To find out what gets backed up in iCloud and iTunes or Finder please see: About backups for iPhone, iPad, and iPod touch.

Have a fantastic day!

2WanderingKs,

Thanks for getting back to us. This article can help you save PDFs with iCloud Drive: Save and mark up PDFs on your iPhone, iPad, or iPod touch with the Books app.

"Your PDF will be available in the Books app on any iPhone, iPad, iPod touch, or Mac, as long as you're signed into the same Apple ID and have iCloud Drive turned on for Books."

Cheers,