Source (Excel) has dynamic sheet name

Hi All, 

My source is an Excel file.  There is only one sheet found within the Excel file and it is dynamic.  

File 1 has a sheet name of:  TRM215-1106217

File 2 has a sheet name of:  TRM215-1113231

I put a file into a folder daily, and Power BI takes the most recent file as its source.  I followed the steps here for reference:  https://wkrzywiec.medium.com/getting-data-from-the-latest-file-in-a-folder-using-power-query-51dfa4bff711

(as you can see in the instructions found within the link, the source is a "folder").  

If I look at the Transform file section, this is what is listed there now:

= (Parameter3 as binary) => let
Source = Excel.Workbook(Parameter3, null, true),
#"TRM215-1" = Source{[Name="TRM215-1106217"]}[Data],
#"Promoted Headers" = Table.PromoteHeaders(#"TRM215-1", [PromoteAllScalars=true])
in
#"Promoted Headers"

The sheet name update is not allowing Power BI to refresh.   I see that it referencing:  [Name="TRM215-1106217"].   Is there a way to take the first sheet, regardless of the name?

I tried replicating previous solutions to this issue but have not succeeded.  Can someone please help me?  Obviously, I am new 🙄.  Thank you!!!