ComfyUI/web/extensions/core/uploadImage.js

import { app } from "/scripts/app.js";

// Adds an upload button to the nodes

app.registerExtension({
	name: "Comfy.UploadImage",
	async beforeRegisterNodeDef(nodeType, nodeData, app) {
		if (nodeData.name === "LoadImage" || nodeData.name === "LoadImageMask") {
			nodeData.input.required.upload = ["IMAGEUPLOAD"];
		}
	},
});