How can I upgrade Pages to next version on iPad?

According to Apple:

1. Go to the App Store app  on your iPad.
2. Tap  or your picture at the top right.
3. Scroll down, then tap Update next to apps you want to update, or tap Update All.

NOTE: After an app is updated, it appears in the list of apps below Updated Recently.

Click ▶︎ iPad User Guide. 📖

Good luck! 👋🏼😉

Update to iPadOS 17.7.8 if you haven't already. Then launch the App Store and in the search field, enter Pages. Tap that result and you may see Pages with an Open button. Click that and it may reveal an Update button. If true, then that will get Pages updated to v14.4 which is the current version today.