You can bulk upload data into Clappia apps by following the steps mentioned below. This is often used when you want to backfill data or upload data from some other system into Clappia.
Click on the Submissions button to land on the submissions page.
Now click on the 3 dots symbol (...) available on the top right of your screen to get a drop-down as shown below.
Click on the 'Upload Excel'. You will see a right panel with a message to download a blank Excel sheet.