Oi, you've got unnecessary formats all the way down to row 1048576. Bloating file size.

Some odd issue is found in workbook... but you can fix it by selecting all sheet, then applying clear formats.

Apply formatting to data range only. It should reduce file size from 5MB + to 12KB.

However, just 2 lines of data isn't enough to help you. Can you upload about 50 rows of data?