How to pass child prop to parent?

I've got some dynamic buttons that are a child component, and get assigned a value="URL" based off of my MongoDB. How do I go about passing that generated value to my parent/web component src={currentSrc}? When I assign it, it says that currentSrc is not defined?

Here's the SizeOptions:

import { useState } from "react";

export const SizeOptions = ({ size }) => {
  const sizeName = Object.keys(size);

  // Update Model Viewers Src
  function changeSize (){
    setSrc(currentSrc)
    console.log(currentSrc)
  }

  if (!sizeName) return <></>;

  return (
    <div>
        {size[sizeName].map((item) => (
          <button key={item} className='size' value={item} onClick={changeSize} currentSrc={item}>
            {sizeName}
          </button>
        ))}
    </div>
  );
};

And here is the ProductScreen:

import './ProductScreen.css';
import { useEffect, useState } from "react";

//Components
import { SizeOptions } from '../components/SizeOptions';

const [currentSrc, setSrc] = useState(size[sizeName][0])

const ProductScreen = ({match}) => {
return(
<div className='sizebuttons'>
  {product && (product.size || []).map((size, index) => (<SizeOptions  key={index} size={size} setSrc={currentSrc} changeSize={changeSize}/>))}
</div>
<div className="productscreen__right">
  <model-viewer
    id="model-viewer"
    src={currentSrc}
    alt={product.productName}
    ar
    ar-modes="scene-viewer quick-look"
    ar-placement="floor"
    shadow-intensity="1"
    camera-controls
    min-camera-orbit={product.mincameraorbit} 
    max-camera-orbit={product.maxcameraorbit}
    interaction-prompt="none">  
      <button slot="ar-button" className="ar-button">
        View in your space
      </button>
  </model-viewer>
</div>
)}

The rendered button:

I have more code inside my ProductScreen, I just tried to keep it as minimized as possible to try and make it easier to help me figure it out! Any help would be greatly appreciated!

Solution

Good news! I finally figured it out after many, many attempts.

So in order to pass from child to parent this is what I came up with:

SizeOptions.js

export const SizeOptions = ({ size, changeSrc }) => {
    const sizeName = Object.keys(size);

    if (!sizeName) return <></>;

    return (
    <div>
        {size[sizeName].map((url) => (
            <button key={url} className='size' value={url} onClick={() => changeSrc(url)}>
                {sizeName}
            </button>
        ))}
    </div>
  );
};

export default SizeOptions;

ProductScreen.js

import './ProductScreen.css';
import { useEffect, useState } from "react";
import { useSelector, useDispatch } from "react-redux";

// Actions
import { getProductDetails } from "../redux/actions/productActions";

//Components
import { SizeOptions } from '../components/SizeOptions';

const ProductScreen = ({match}) => {

    const dispatch = useDispatch();
    
    const productDetails = useSelector(state => state.getProductDetails);
    const { loading, error, product } = productDetails;
    
    const [ src, setSrc ] = useState("Default URL")

return(

    <div className='sizebuttons'>
        {product && (product.size || []).map((size, index) => (<SizeOptions  key={index} size=  {size} changeSrc={src => setSrc(src)}/>))}
    </div>
              
    <model-viewer
        id="model-viewer"
        src={src}
        alt={product.productName}
        ar
        ar-modes="scene-viewer quick-look"
        ar-placement="floor"
        shadow-intensity="1"
        camera-controls
        min-camera-orbit={product.mincameraorbit} 
        max-camera-orbit={product.maxcameraorbit}
        interaction-prompt="none">  
        <button slot="ar-button" className="ar-button">
            View in your space
        </button>
    </model-viewer>
)};

The only issue now is how to make the "Default URL" actually be a URL as right now if I put {src} there, it says it cannot do that before the component is rendered.