I received a short message prefixed with an upload notification.

What you want to ask is "Why did you receive a short message prefixed with upload notification?" This may inform you to upload a file or photo to a platform or service.

This kind of SMS notification usually contains information of uploaded files or photos, such as upload time, file name, size and so on.

If you haven't uploaded it, this short message may be fraudulent information. It is recommended that you don't click on links or attachments in short messages easily, so as not to cause property or information loss.