Example: Upload stuff after post save with schedule

wp-upload-schedule.php

<?php

namespace PublicFunctionOrg/WordPress/UploadStuffViaCron;

// queue for schedule
const POST_META_UPLOAD = "public_function_org_upload";
add_action('save_post', function($post_id){
	update_post_meta($post_id, POST_META_UPLOAD, 1);
});

// upload via schedule

const SCHEDULE_ACTION = "public_function_org_upload_stuff";

function init(){
	if(!wp_next_scheduled(SCHEDULE_ACTION)){
		wp_schedule_event(time(), 'hourly', SCHEDULE_ACTION);
	}
}
add_action('admin_init', __NAMESPACE__.'\init');

function run(){
	// 1. get all post ids that have post meta value
	// 2. upload stuff
	// 3. delete post meta value
}
add_action(SCHEDULE_ACTION, __NAMESPACE_.'\run');