Cannot drag file onto Electron app dock icon - macos

Question

I want to try to build out a simple Electron based macOS app that let's a user drag a file to the app's dock icon and then does something with that file.
However I cannot find a way to drag a file to the dock icon and detect that event. I notice that when I hover over the dock icon with the file it doesn't look like I can drag it there (the icon doesn't go darker as it does with with Safari or Notes).
I followed the official Quick Start guide to create a minimal electron app for starter.
I found little guidance on what a would like to do but came up with the following code that is able to open the window, load my blank index.html but doesn't achieve anything drag related.
main.js
const { app, BrowserWindow } = require("electron");
/* Create and open the App */
app.whenReady().then(() => {
createWindow();
app.on("activate", () => {
if (BrowserWindow.getAllWindows().length === 0) createWindow();
});
});
const createWindow = () => {
const win = new BrowserWindow({
width: 800,
height: 600,
titleBarStyle: "hidden",
});
//win.loadURL("https://electronjs.org");
win.loadFile("index.html");
win.show();
process.argv.forEach(handleFile);
console.log("window opened");
console.log(process.argv);
};
/* Drag file unto App icon */
app.on("open-file", handleFile);
app.on("open-url", handleFile);
// You can get the dragged file's path like this
if (process.argv.length >= 2) {
const filePath = process.argv[1];
handleFile(filePath);
}
// If you only allow a single instance of your application to be running
// you should use the 'second-instance' event to handle the case if your app is already running
const gotTheLock = app.requestSingleInstanceLock();
if (!gotTheLock) {
app.quit();
} else {
app.on("second-instance", (event, argv, workingDirectory) => {
// Someone tried to run a second instance
// Handle argv here
if (argv.length >= 2) {
const filePath = argv[1];
handleFile(filePath);
}
});
}
function handleFile(filePath) {
// handle the file as you want
console.log("handleFile", filePath);
}
Thanks for any guidance in a good direction!
Aaron