When a file is saved, Project Plan 365 will identify if it is created with Microsoft Project or Project Plan 365. The warning message will appear if the file was created with Microsoft Project and if the project file contains unsupported functionalities.

We don't have a mechanism to control via our app where the files are saved or restrict sharing based on internal policies.

To be extra safe, enter a small number in the minutes box, like 10. That way, you’ll never lose more than 10 minutes of work. On the other hand, if you want to make the application faster, try entering a larger number in the minutes box, like 20.

To set the interval for auto save, go to File – Options. In General Settings tab look at General Options section. Make sure the auto save box is selected and change the interval as you please then press OK.