I have the same problem. I use Firebase to host my ringtones and I got "Apps should not ... include the ability to save, convert, or download media from third-party sources (e.g. Apple Music, YouTube, SoundCloud, Vimeo, etc.) without explicit authorization from those sources." The sounds are all beep, boop, computer generated sounds that are mine, but still public domain I guess because most don't even have 3 tone/notes to them to be considered music. I have no way to disprove a negative if they assume I didn't make them. Do I need some document from Firebase, or if they assume they aren't my own audio files is that just the end, as they don't accept me giving myself permission?