Folder source with CSVs, how to remove headers from each before merge?

OK, my Transform query looks like this:

let
    Source = Csv.Document(#"Sample File Parameter1",[Delimiter=",", Columns=3, Encoding=1252, QuoteStyle=QuoteStyle.None]),
    #"Promoted Headers" = Table.PromoteHeaders(Source, [PromoteAllScalars=true])
in
    #"Promoted Headers"

This is the "Transform Sample File from "folder"" query.

You should also have a function (fx) that looks like this:

let
    Source = (#"Sample File Parameter1") => let
        Source = Csv.Document(#"Sample File Parameter1",[Delimiter=",", Columns=3, Encoding=1252, QuoteStyle=QuoteStyle.None]),
        #"Promoted Headers" = Table.PromoteHeaders(Source, [PromoteAllScalars=true])
    in
        #"Promoted Headers"
in
    Source

Then you should have your main query that creates your data table that looks like this:

let
    Source = Folder.Files("c:\temp\powerbi\csvs"),
    #"Invoke Custom Function1" = Table.AddColumn(Source, "Transform File from csvs", each #"Transform File from csvs"([Content])),
    #"Renamed Columns1" = Table.RenameColumns(#"Invoke Custom Function1", {"Name", "Source.Name"}),
    #"Removed Other Columns1" = Table.SelectColumns(#"Renamed Columns1", {"Source.Name", "Transform File from csvs"}),
    #"Expanded Table Column1" = Table.ExpandTableColumn(#"Removed Other Columns1", "Transform File from csvs", Table.ColumnNames(#"Transform File from csvs"(#"Sample File"))),
    #"Changed Type" = Table.TransformColumnTypes(#"Expanded Table Column1",{{"Source.Name", type text}, {"column1", Int64.Type}, {"column2", Int64.Type}, {"column3", Int64.Type}})
in
    #"Changed Type"

My CSV files are very simple, they look like this:

one.csv

column1,column2,column3
1,10,100
2,20,200
3,30,300

two.csv

column1,column2,column3
1,10,100
2,20,200
3,30,300

three.csv

column1,column2,column3
1,10,100
2,20,200
3,30,300

My data table looks like this:

Source.Namecolumn1column2column3