How to download PDF from Google drive on iPad?

You must first install the Google Drive App on your device - and sign-in to your Google account; the Google Drive App integrates with the native iPadOS Files App.

Once installed, you’ll be able to access, copy, move and manage your Files directly from either the Files App - or the Google App.

https://apps.apple.com/gb/app/google-drive-online-backup/id507874739

Hello Yibo_Wang,

It sounds like you want to know how to import PDFs into your iPad. We know how important this is for you, and you’re in the right place to find a resolution.

Here's a resource and steps that can help:

• Save and mark up PDFs on your iPhone, iPad, or iPod touch with the Books app

Farewell!