Google said on Wednesday it would offer an audio-only option on its Duo video calls service to help users communicate using poor-quality connections, and was adding a feature to permit file sharing in group chats on its Allo messaging App. The company launched Google Duo in August, providing video calls for users on Android and iOS, pitting it against Apple Inc's FaceTime, Microsoft Corp's video-calling app Skype and Facebook Inc's Messenger. Google, owned by Alphabet Inc, said audio-only calls on Duo would be available from Wednesday in Brazil, and would be rolled out to users around the world in the coming days. The audio-only calls would work well on all connection speeds and be data efficient, Google Vice President for Product Management Mario Queiroz said in a blog post after he announced the moves at a Google conference in Sao Paulo. In response to requests from users in countries like Brazil, Google said that Android users everywhere would be able to share documents and other files (.pdf, .docs,