According to source code discovered by the unofficial Google System Blog, Google Play Music users will soon get the ability to upload music directly to the service from directly within their browser. As of right now, in order to upload files to the service, you have to download Google’s Music Manager app and select which files you would like to upload.
The source code discovered reads “Drag songs or folders here to add music to your library. Or, if you prefer, select from your computer.” Google already allows users to drag and drop files to nearly all of its other online services, so it makes sense that Play Music would be next in line to receive the feature.
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It’s unclear when Google intends to roll this feature out, but this source code does give us a hint that it is not too far off in the future.