Hey @thomasdeschaetz welcome to the forums!
Thank you for your post and sorry that you are experiencing issues. However, we may not be able to help you with this issue if you do not complete the template fields fully.
Without a code excerpt and/or the link to your Repl there won’t be much we can do to help you. A screenshot of the expected output would also be appreciated.
The more information you provide at the start, the easier it will be to identify the problem.
Hi @thomasdeschaetz welcome to the forums!
You can upload csv files by clicking the 3 dots in the Files sidebar > Upload File. Or, you can create a .csv file and put the data in there.
Hope this helps!