@Gleb Smolnik​ :

The init script runs on the cluster nodes before the notebook execution, and it does not have direct access to workspace files.

The documentation you mentioned refers to placing the init script inside a workspace file, which means you can store the script itself in a file within the Databricks workspace. However, it doesn't grant direct access to other workspace files from within the init script.

To access a workspace file within the init script, you can consider using the Databricks CLI or Databricks API to retrieve the file and then copy or read it on the cluster nodes during the init script execution.