I'm confused by your wording with "importing". The process I follow is to create a PBIX file in Desktop, use File | Publish to publish it to the Service. I can then, later, update the report and use File | Publish to publish the file again to the Service, it recognizes that there is a Dataset, etc. with the same name and asks me if I want to replace it. I indicate yes and it updates the dataset. Definitely works, I've done it dozens if not hundreds of times.
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