From email: exporting to MS project

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My question is about importing data to MS project format.
I see export options as MSPDI and MPX, while I am able to use the online version of MS project 365 which can take only .mpp files.
Is there any option for importing project files from Gantt to MSP in my case?

I don’t know what exactly is MS Project 365, but I really doubt that MS Project can’t import files in their own Project Data Interchange format. It may be called “XML format” in their user docs and user interface, and MSPDI files are actually XML files with MS Project specific tags.