Maybe a slow day for me, but from the homepage and video it isn't clear - does it do anything that cannot be achieved with plain Google Docs?
It seems like it manages some metadata around google docs, but google docs is doing all the heavy lifting (creating/editing/sharing documents). Which begs the question, why?
By titling itself as a document management system I would assume it would be something like paperless-ngx[0] or mayan edms[1]. The latter of which has a built in workflow system[2].
But by being tied to google docs you can't really self host the important parts
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0: https://github.com/paperless-ngx/paperless-ngx