If you need to print anything to PDF on iPhone or iPad, you should know the feature is built into iOS and iPadOS, but it's hidden.

How to create a PDF file It’s easy — just use your print feature by Barbara Krasnoff Mar 9, 2021, 8:20 AM PST ...

Alternatively, select "File" and "Save as PDF" to use the built-in QuickBooks PDF printer. Click "Print" or "Save." Then, select a location on your hard drive to save the PDF file.