iPad and iPhone Markup

Well, it only took me 4 1/2 years to learn about this handy feature, which became available back in iOS release 9.  Markup is available within a number of apps, including Files, Messages, Safari, and Mail and allows you to add text, shapes, and signatures to PDFs and photos.  Detailed instructions can be found at this Apple support link.

https://support.apple.com/en-us/HT206885