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 commentLarry commented
What is the current status on this issue? I just opened the trial version and have files that I want to upload to both P4W and Project Pro Online. I need to know if I can do that or not and, if not, when will it be available... I have some small projects run by accidental managers and larger more complex projects run by full fledged project managers and need to demonstrate how this can replace Wrike and Trello...