Adding a file upload question can be a convenient way for requestors to add additional information with their request. When you add a file upload question to your form and files are uploaded by the requestor, the add-on will include the link to the files on email notifications. If your requestors or recipients need access to these files, you will need to ensure sharing permissions (of the Google Drive folder) are set appropriately.
To access the Google Drive folder:

If you have multiple file upload questions in your form, you will need to perform the above steps for each folder.