Can custom audio be uploaded in gta online?

The only verified information in the source concerns the development of Grand Theft Auto V, including its release dates and the teams involved. It does not mention any feature that allows players to upload custom audio files into the multiplayer component of the game. Consequently, there is no evidence from the provided material that custom audio uploads are supported in GTA Online. Without additional documentation or official statements, we cannot confirm the existence of such a feature.