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?

How to Unzip a File on Your iPhone or iPad and How to Create Zip Files Friday September 20, 2019 Aman Rashid ...

Zip files compress your folders or files and save storage on your computer. They're also easier to send from device to device. Here's how to make one.

Use a simple Automator workflow to compress multiple files into multiple archives.

Knowing how to create zip files can make a difference in your document storage. The stuff inside won’t take a lot of space, and the latest file formats are often larger.