How does my Project schedule get stored in Teams?
This article explains how the feature works for storing your Project schedule file in a Teams document library rather than locally on your desktop.
This feature requires that your admin has configured both the Project Professional and Microsoft Teams apps in OnePlan.
Storing Microsoft Project Templates
In SharePoint, add an app.
Select Document Library as the type.
Name the Document Library "PlanTemplates".
Upload Microsoft Project .mpp templates