The simplest way to convert an XLSX file to SAS dataset(s) is to use the XLSX libname engine and PROC COPY.
libname in xlsx 'mysheets.xlsx';
proc copy inlib=in outlib=work;
run;
The question of "uploading" depends a lot on your setup. The SAS code above needs to be able to see the XLSX file to work. So if you have the file on your PC but you are running SAS on some other machine (or in a virtual machine) then you need to move the file to a place where SAS can see it.
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