Importing new tests with shared steps from Excel to Silk Central

I am trying to import a new set of tests into Silk Central project from Excel. I want shared test steps to be generated when I do the import. In the documentation for Silk Central 20.5, it says: " To add a new shared step in Silk Central when importing or updating from Excel, specify the SharedStepID in Excel."

I've populated the SharedStepID column in the Excel file with sequential numbers starting from 1. When I run the import, I get a Silk Central Message: ERROR The called shared steps object does not exist. I read in the documentation that you have to create the shared step object on an existing test, so I don't understand how it's supposed to work when importing brand new tests.