When talking to a contact on Google's upcoming Allo messaging application, there are a few different types of attachments you can send. We've already discussed voice messages and stickers, but you can also share your current location, a photo or video taken instantly with your camera, and also media files taken from your camera roll. Unfortunately, sending other types of files like music or documents doesn't seem to be possible - at least not with the test preview version of the app that we're basing this information on.

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