how can I create a folder on website for anyone with the link to be able to upload to

I'm setting up a charity website and want to be able to have a page where anyone can upload images to a folder. How can I go about this?

Check out this website, it has a tutorial on setting up a PHP file uploader - W3Schools
Make sure your validation on the files being uploading is well made otherwise you'll run into all kinds of security issues.