More information: http://www.sbctech.net
Manual : https://t.ly/uD6Rj
G Suite add-on for the GDriveFlow WorkFlow system published at G Suite Marketplace. 
Provide various workflow functions-approve/cooperate/reject/query/withdraw, distribution of common forms, and reusable documents.
Gmail add-on associated with email notification of GDriveFlow system.
The approved documents are automatically delivered to the 'Approved Document Manager' and managed in Google Drive of the Approved Document Manager.
All approved documents are automatically saved in PDF format and searched in Google Drive of Approved Document  Manager. 
Integrated with Google Drive Preview function.
True Cloud workflow based on Google Cloud Platform App Engine (stability, performance-proven engine).
Easy installation and maintenance, administrator can install easily from G Suite Marketplace.
Mobile support, document preview, approve, reject, query, search in a mobile phone.
30-days free trial and reasonable price.