This article discusses why a user is unable to submit a google form that requires the person submitting the form to upload a file. Users may see a message explaining that "uploading files is not permitted when data loss prevention is enabled for your domain."
Users will encounter this issue when attempting to submit a form that requires the person submitting to upload a file, and the form is hosted outside of Virginia Tech's network. Due to Google's Data Loss Prevention (DLP) policy, which is enacted within Virginia Tech's domain and cannot be altered, submitting a form like this is impossible. It is an attempt by Google to avoid sharing internal information on an external form.
Users may try to solve this issue by contacting the form owner and proposing an alternate upload method or by not using Google Forms for this use case to begin with.