Planner MPP Bulk Import
Import your MPP files into Microsoft Planner
MPP Bulk Import helps you import your MS Project files into Planner Premium. Files can be imported one by one or simultaneously.
It augments the MPP Import functionality that is already available in Project for the Web and Planner Premium (via Power Platform).
The import is a one-off operation, meaning it does not sync the imported tasks with the source MPP file. In case if you would like to keep the tasks in sync, you can use the Project Sync tool. Project Sync allows you to synchronize tasks back and forth between MS Project files and Planner Premium, keeping them in sync.