Yes, you can change the default app associated to a file on iOS/iPadOS:

Since the new iPads were introduced several weeks ago there has been a lot of talk amongst Apple pundits about what one can and can’t do on an iPad. One of the complaints I encountered was about not being able to set a default app to open certain file types in iPadOS.

A couple of weeks ago I mentioned the same tip for the same complaint. There was no reply, so… 🙃