iOS added print support years ago, and Printopia and then other software rose to meet a challenge: supporting printers that didn’t use Apple’s AirPrint. But they also added a nifty workaround to the missing ability to create PDFs from email and other software that supported print via a Share button, but didn’t have a workflow that led to a PDF.
Printopia had to be hosted on a Mac, and it let you share any printer a Mac could access, as well as add printer and file-storage devices as printers. You could print to PDF on the attached computer or print to Dropbox. iOS 10 finally adds a subtle way to get the same effect without needing additional software. (Printopia ($20) is still pretty cool for a lot of other purposes, by the way.)
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