When clicking on "Manage File Attachments" some customers are being prompted to login and then get the error message "Login Failed - Your username, or password may be incorrect, or the account may have expired. 530 Access denied", therefore not being able to upload nor download files to support cases.
In order to resolve this issue you will need to update your existing password. You can do this via your Personal Profile or by using the "Forgot Password" link. Once the password has been updated, you will no longer be prompted to login and will be redirected directly to the page.
In case this does not resolve your error, please contact the Customer Care for assistance.