User Profile

I once found a section of 'User-Generated Contents' in the Appstore guideline of apple. (https://developer.apple.com/app-store/review/guidelines/#user-generated-content) In the case of a specific application related to a cloud service, like Google drive, how that 'User-Generated Contents' can be defined? I mean, if a Google drive app user uploads a music file to google drive via the iOS application of google drive, will that music file be considered as 'User-Generated Contents' according to apple's Appstore guideline? Or it doesn't matter with it?