This article explains how to move images in a Google Doc on the website and from the mobile app for Android, iOS, and iPadOS.
How to Move an Image Anywhere in Google Docs
You can move an image to a different part of the document in Google Docs at any time. For example, you may need to move an image closer to the text it describes.
All you need to do is simply drag and drop the image, but there are a few settings you need to know to get the image to fit perfectly.
You can do this on the Google Docs website: