where do you want to upload?
or you mean to load?
if load then check this out
for each FileExtension in 'xls','xlsx'
for each FoundFile in filelist( Root & '\*.' & FileExtension)
LOAD *, '$(FoundFile)' as SourceFile
FROM [$(FoundFile)] (ooxml, embedded labels, table is sheet1);
Set vConcatenate = Concatenate;