Best Practices for using Spotify image URLs in web application

[ianm118]

I am developing a web application that helps users organize some of their media. Obviously this involves a lot of pictures like Album covers and whatnot that spotify provides. Is it ok to use Spotify image URLs on the front end of my app or should I be downloading them and distributing the images from my backend (in this case some of the other images involved in the application are stored in AWS S3 and distributed using the AWS CDN). If there is any official guidance on this from Spotify as well that would be helpful. Thanks!