I am intrigued by this app, however since I often access my tasks through a mail client and other apps that use DAV, does this app coordinate (if even a subset) with WebDAV?
Since version 1.1.0 a basic integration with CalDAV is available and Deck boards can appear in the Task and Calendar apps. Note that this integration is not yet complete.
Since version 1.3.0 new attachments are stored in the user folders and are therefore accessible via WebDAV.