At a Glance
Dropbox is an online backup and file-sharing service that lets you upload, download, share, and access your files across multiple devices. The Dropbox Android app doesn't offer the full functionality of Dropbox's desktop client, but it does provide useful mobile access to your files.
With the Dropbox app for Android, you can create a new Dropbox account or link to an existing account. You get 2GB of online storage for free. Two levels of paid subscriptions are available: 50GB of online storage for $10 per month (or $99 per year), and 100GB of online storage for $20 per month (or $199 per year).
The Dropbox app for Android lets you shuttle files to and from your Dropbox account, record and upload voice memos, and automatically upload photos and video taken with your phone's camera. By accessing your Dropbox account, you can also view files, stream music and video, and create new folders. Beyond that, however, some important features are missing.
Oddly, you can delete a file but you can't move or rename it. Folder sharing, a feature available in the desktop client, is not enabled in the Android app. Similarly, folder watching, backup, deletion, and renaming are unavailable, and though you can view files, you can't edit them using the Android app. An SD Card file browser would be useful, but Dropbox doesn't provide one.
The app also has a bug that may confuse some users. You can share a file either as an e-mail attachment or as a link to a download page, but when sending the file as an attachment, Dropbox mistakenly offers the option of sharing the attachment via Facebook or Twitter. Unfortunately, Facebook and Twitter don't let you share attachments, so that option should be eliminated.
The Android app lacks so many of the features found in the desktop client that it will undoubtedly disappoint some people. The app provides enough functionality to justify installing it if you are already a Dropbox user, but it leaves a lot to be desired for new users.