We are sorry for your difficulties as you are experiencing a 404 error code while opening any file links. Could you please let us know what type of files you shared with the team and also the application you used to share the files?
We are here to help, it's just we need more information to investigate.
Thank you for the information. Could you please let us know the OS version on your PC as well as the Creative Cloud Desktop Application version installed? Also please try changing the browser and see if it works. Please let us know if the error occurs only with PDF files or with other file types as well. Is there anyone else facing the same issue?