One App to manage your cloud storage accounts - Unclouded Cloud Manager
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The way it works is you sign into your Dropbox, Google Drive, etc, and the application allows you to root around and do things with the files therein. One of its more unique features is the ability to detect copies so you can get rid of any duplicates between your various cloud storage accounts. It’s also done up in Material Design so it looks good.
https://play.google.com/store/apps/details?id=com.cgollner.unclouded