Does UML is nessary?

Thanks for your reply.

Yes, I agree your point and also believe the process flow is necessary.

Sorry I forgot to explain more detail about the situation…

I totally agree that the flow diagram is necessary and important to help us create it.
But I think it has to be done before building stage.
And my team didn’t know the regular process about the project from 0 to 100.
During that time, they asked for speed and without enough labor force, therefore, they just push the project finish asap without flow diagram.

After we finished the project, then they ask for a flow diagram.
That’s the reason I thought why I can’t just use the flowchart from UiPATH instead of making a new flow diagram.