Imported excel file showing black screen

I upload an excel file in both CSV and Xlsx format to see if either worked to the ‘assets’ folder in snack.dev online version. However, after uploading the file nothing shows up. I see that the file is attached but when clicking on it nothing appears. I implimented a readExcelFile and such to the code and shows no errors but still nothing happens when saved and published. Please help, running out of time on this thanks