To use parameters, which expecially helps when moving files from your local computer to the web service, perform the following
Open Power Query Editor
Click Home
Select Manage Parameters
Click New
Give it a Name (tacticalware)
Specify a Type from the drop down. For me I selected Text
In the Current Value field, specify the location of the csv file (C:\tacticalware\x.csv)
NOTE – it is case sensitive
Click Ok
Now go into your Advanced Editor
Find the location of the csv file (C:\tacticalware\x.csv)
Replace the path with the Name of the parameter (tacticalware)
So it will look like this:
Source = Csv.Document(File.Contents(tacticalware),……and so on
Click Done