If the CSV upload button is missing, your project is likely set up as an Event. To enable the CSV upload option, go to Project Options and change the project type to Data. The CSV button will then appear.
How to Resolve a Missing CSV Upload Option
If the CSV upload button is missing, your project is likely set up as an Event. To enable the CSV upload option, go to Project Options and change the project type to Data. The CSV button will then appear.