AirDroid enables you to send and receive SMS (text) messages from your computer. In my experience, though, MMS (picture) messages did not show up in the web interface. But that's just a minor little nitpick.
We’re always listening and looking for ways to make Dropbox fit more seamlessly into how you work — no matter which device you’re on. Exporting Dropbox files to an external SD card has been one of our most-requested Android features, which is why we’re excited that it’s part of our latest Dropbox for Android release, available for all versions of Android.
Read More: How to export contacts from Android to iPhone 6S/6
Exporting Dropbox files to your SD card gives you an easy way to transfer all your stuff — meeting agendas, trip photos, shopping lists, and more — as you move between Android devices, even without an Internet connection. And, it’s a great way to have important files with you offline when you can’t save any more favorites directly to your device.
It takes just a few steps: start by tapping the “Quick Action” button to the right of the file you want to export, select “More”, then “Export”, and tap “Save to Device” to pick your external SD card. (If you don’t see your external SD card listed there, choose the menu within the “Save to” screen, followed by “Settings” and then “Display advanced devices”.)
Tips: Once lost data on your SD card,you can use a Android Data Recovery to recover data from Phone's SD Card
The latest release of Dropbox for Android, which also includes improved Android L support and faster search performance, is rolling out in the Play Store over the next several hours. If you’ve signed up for early releases in your Android device settings, you can download it from your device notifications now!
There is some functionality within the app itself (on the Android device). You can delete, copy, and share files on the app (no connection with your computer required).
You can also choose to enable a phone locating feature.
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How to recover data from Android SD Card