A feature was recently added that allows flows to be manually launched from a SharePoint document library. These Flows can currently only be launched by the owner of the flow, and not by people who have contribute rights on the library. Considering that the entire purpose of a SharePoint library is to allow users to work together on documents in the context of business processes, it would be helpful if the workflow tool supported a multi-user environment. Also, SharePoint Designer workflows can be launched manually, and have had that capability for years. Since Flow is being positioned as the replacement for SPD workflows, it would be helpful if it had this basic functionality.