Moving from Wave Apps, Importing nothing works

Hi, I have the latest self hosted version of Akaunting 3.1.14

I am trying to import Products, customers and vendors from a XLSX file but it is not working. I have downloaded the template given and tried that and it still does not upload, even if I try and upload the template without any changes it does not upload.

I have also tried to use the wave app but on my self hosted dashboard there is no wave app, on searching I can only see FLutterwave

Is this a known problem, can someone help me diagnose why it is not working

Thanks
Gerald