You can combine multiple PDF files into a single, easy-to-share document using simple software on your Mac computer or Windows PC. Here's how.

Copilot on Windows can now retrieve files from your PC’s hard drive. I've tested the AI-driven search feature and show you how to benefit.

Need to make notes in a PDF, or perhaps correct a few typos or reorganize the pages? Here are the tools and tips you need.

The other is you may have accidentally changed your computer's default app for opening PDF files yourself.