Initiate SharePoint Designer Workflow (Manual) via Ms Flow

[Tarundeep Singh]

I have a SP library and on each item I have a flow button. Now when the flow is activated for a particular item I need to initiate a SharePoint Designer workflow which was until now initiated manually. 

Is there any way to achieve this, please let me know.

Thanks in advance.

[#2]

The only way I can thing you could do this is by means of an HTTP Call in your flow that calls the legacy SharePoint Workflow API...I know for sure there is a CSOM package for the legacy workflows, but not checked if the same happens in regards of a REST API available