When I load your tables, I get the following Mcode. Don't see anything wrong here.
let
Source = Excel.CurrentWorkbook(){[Name="Table2"]}[Content],
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Account", type text}, {"Address", type text}, {"Amount", Int64.Type}})
in
#"Changed Type"
Perhaps if you load your files along with the Power Query so we can see exactly what you are doing or trying to do. It would also help if you expanded on what you are trying to do specifically. Mind reading is not my forte.
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