Addressed issues with internal and external storages.
Remissioning of DS1922 now happens much faster.
Replaces background syncing with Google Drive with an explicit syncing activity, accessible from the 'Manage Files' screen.
Addressed the issue that occasionally caused the app to crash on the 'Manage Files' screen.
Addressed the issue where the external storage location could not be initialized on Android 7 (when using Samsung S7).