Expo Camera Photo Upload To Firebase Storage is undefined - React Native

Question

I am using import { Camera } from 'expo-camera'; to take pictures. The taken picture is stored in the devicecache. so far so good.

Now I am trying to upload this taken images to Google Firebase Storage using import { getStorage, ref, uploadBytes } from "firebase/storage";

The return of doing a photo is:

{ 
"width":5472,
"uri":"file:///data/user/0/host.exp.exponent/cache/ExperienceData/%2540g1sm0%252Feprojstant/Camera/3689f575-d849-4e3e-b4ea-1ba40b96cf02.jpg",
"height":7296
}

Now I try to upload this like that:

const storageRef = ref(storage, 'some-child');
const file = photo.uri 
        uploadBytes(storageRef, file).then((snapshot) => {
            console.log('Uploaded a blob or file!');
        });

After a little delay, there is a file created in firebase/storage . I can open this file by an texteditor. the file includes the text undefined

The assumption is that the uri that i hand over is not the right solution. However, I'm too new to development and can't find any help for react native. do you have an idea, a link or an example? Do I first have to convert the file to a blob or base64 and if so, how?