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