You use security roles to control the creating and editing of personal and organizational templates. Word and Excel templates share the same security privileges, as shown in the following screenshot:
If you upload a document template from within a view in a model-driven app, the template will be a personal template. You can share a personal document template with users and teams.
If you upload a document template into the Document settings under Advanced Settings, the template will be an organizational template:
By default, the template will be available to all users, but you can restrict a document template to users with specific roles by clicking on ENABLE SECURITY ROLES in the command bar and selecting the relevant roles, as shown in the following screenshot: