How to anonymise user file uploads in MS Forms

Hi, I've created a form to allow users to anonymously report IT incidents, but when someone uploads a file I'm getting an email from Sharepoint Online telling me the name of the user who's uploaded it. The red in the top right is the users name. The form itself doesn't tell me the username, that part of the anonymisation is working fine, it's just this bit related to file upload.

This kind of defeats the point of allowing anonymous reporting, and whilst the users wouldn't know, it is a breach of trust when we're trying to create a positive attitude to security.

Is there a way to turn this off?