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
I signed up for the trial expecting to be able to use Project Web to review project plans produced on the desktop... can't do it, making the Web tool a waste of time. Smartsheet has better functional integration than the MS product, which is a pity.