Mailmerge: using multiple spreadsheets on 1 document

Hello,

I generate a new spreadsheet daily and got a standard email document for these values. The spreadsheets have the same headers every time but i have to change the values in the document for every spreadsheet to get mailmerger to use the spreadsheet. Is it possible for mailmerger to look at headers only and not filename?

Thanks in advance.

Maybe could be easy, copying the daily generated file to the source mailmerge file.

i guess thats the only way to do it, thanks