How to open file from SharePoint 2013 hosted on premise?
You can open only mpp file from SharePoint Online.
How can I use One Drive?
You may access the MPP files stored on OneDrive cloud, enabling distributed teams to work in an efficient way.
To access a project plan from OneDrive you first need to locate the Open from OneDrive menu option and then type in the login credentials information. This step will be skipped automatically by OneDrive if the user is already authenticated. Permit to the application to connect to the required services and then in the Choose project form, select the project you want to open and click on Open button.
If you have a Business account, select OneDrive for Business.
If you have a regular account, select OneDrive.
Download and install our latest application from the link below:
In order to use the Master project and subprojects feature, you need to upgrade to business trial from Online Portal. Just Sign in with your email and password in Online Portal page then click on Upgrade to Business button:
Then, open Project Plan 365 application and Sign In with your email and password (look upper right corner for Sign In button). Save your projects to your Business Drive 365 folder. After all your projects were saved on Drive 365, you can create a master plan by adding the subprojects from menu Project->Subproject->Drive 365.
Please read the article below about how to use master project and subprojects in Project Plan 365 application: