Sync your files and folders between Dropbox and Android device with following options.

Replicate
    File added on one side, copy to other side.
    File modified on one side, copy to other side.
    File deleted from one side, delete from other side.
    After sync two folders will be replica of each other.
Mirror Up (Dropbox Mirror Copy of Device)
    File added on device, copy to google drive.
    File modified on device, copy to google drive.
    File exists on google drive but not on device, delete from google drive.
Mirror Down (Device Mirror Copy of Dropbox)
    File added on google drive, copy to device.
    File modified on google drive, copy to device.
    File exists on device but not on google drive, delete from device
Sync Up (Upload Only)
    File added on device, copy to google drive.
    File modified on device, copy to google drive.
    File deleted from device, no action.
    No changes are made to device folder
Sync Down (Download Only)
    File added on google drive, copy to device.
    File modified on google drive, copy to device.
    File deleted from google drive, no action.
    No changes are made to google drive folder
Move Up (Upload Then Delete)
    All files from device moved to google drive.
    After sync no files are left on device folder.
Move Down (Download Then Delete)
    All files from google drive moved to device.
    After sync no files are left on google drive folder.
Download from Google Play Store