Yes, ZIP files. Turns out, PDF Expert is one of, if not the best app, for unpacking and creating ZIP files. You would think Dropbox or iCloud Drive would be better at handling ZIP files, right?

This article describes what ZIP files are and why they're used in some situations. We'll also look at how to open one to see its contents, and how to convert the files inside to a different format ...

It's easy to convert images into PDF files -- whether on Windows, Mac, or directly on your mobile phone. We'll show you how it works.

Windows allows you to convert any image file with JPG, JPEG, PNG format to PDF without installing any third-party software via Windows Photos App.