Power Query Not Recognizing Header Row in CSV when combining multiple files from SharePoint folder

I assume you are using the Combine & Edit functionality to combine your csv files, where a function and query from a selected example file is auto generated. If so, you can just add a Promote Headers step in the example file query, which will auto update the function and apply it in your main query.

If not, you can create a custom column on your table of Binary files and use Table.PromoteHeaders(Csv.Document(... to extract the table of data from each file with the headers already promoted.

Pat