URGENT HELP: Getting 404 error for Firebase uploaded media url

I'm stuck with this problem for the past one hour, when a user uploads a media(img) it works fine as usual and returns the url path, but when I access the path, ie paste the url in the browser I get this error:

{ "error": { "code": 404, "message": "Not Found." } }

Everything was working good, but suddenly this happened. Any urgent helps/solutions will be highly appreciated and will be saving my butt. Thanks!