How to exchange Twitch profile picture on iPad Pro?

You'll need to use a web browser, since the Twitch mobile app doesn't support profile picture changes. Just open Safari or any other browser you prefer, go to the Twitch website, and log in to your account. Then, tap on your profile picture icon, select "Profile," and you should see an option to edit your profile picture. Upload the new picture you want to use, adjust it if necessary, and save the changes.