The iPad lacks the ability to attach a document to an email message from the email composition screen. Rather, you must attach a document from within the application that views it. The iPad has ...

You can attach any type of file to an email message, such as a PDF, JPG or XLS. Some recipients may block potentially dangerous types of attachments like EXEs though.

It's easy to attach a file in an iPhone email using the new format bar in Mail with iOS 13, or in the Gmail app. Here's how to do both.

Want to add a picture, video, PDF, Pages document or other file to an email in Mail on the iPhone? Don’t worry: it’s easy.

You can insert a PDF into Word via the File, Open menu, which turns the PDF into an editable document, or as a non-editable image.