2.1.3
* Fix sync failures with sub-directory
2.1.2
* Remove additional choosing account
* Build with android 5.0 and the latest google play service
2.1.1
* Add google drive check before sync
2.1
* Add sync-up of SD card and system folders (upload only).
* Fix crash while downloading cloud documents. The cloud documents can only be exported. Skip download in current version.
* Fix crash while listing local removed folder