Thank you for your feedback. For now, you can use an API through Powershell to import .mpp files in Project for the web. You can learn more here: https://techcommunity.microsoft.com/t5/project-blog/import-project-desktop-files-to-project-for-the-web-api/ba-p/2031298
We are also looking into other ways to support import. Stay tuned for future updates.
An error occurred while saving the commentAnonymous commented
Very disappointing product and service support. Have been paying for 2 licences for Project Plan 1 as we are now working from home and seemed a good solution. We are unable to use it and been waiting for office support service to get back to me for 3 days now as they had to escalate the problem that they couldnt solve. Can create new project but ... Can't open existing plans, cant print. can't PDF - so really its pretty pointless product for us.