I have done the exact same thing as they have said in the module. But some how I am getting error like this: 
Challenge Not yet complete... here's what's wrong: 
Can't find the forceContent:fileUpload Lightning component in the 'New Lead' flow. Make sure the field’s unique name is 'Upload_File'
Though I have named the field as 'Upload_File'!!!

I am attaching the screen shot of how I have done it below..
My flow is also active and is also inclued in the page named "Process Automation Home". I don't know what is wrong. Kindly help me.