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"InvalidFileSizeError" when upload for temporary storage with Rest API

I am trying to upload a pbix file that is over 2 gb using Power Shell and the Rest API. 


Reading the Post Import In Group documentation I see I have to upload to a temporary location and then pass a "fileUrl" in the body of the import request.


I used this Power Shell script provide by Microsoft. The upload of the file to temporary storage works fine but I get  "code": "InvalidFileSizeError" when trying to import the file from the temporary storage. 


I did see this one post on the forum about passing the size of the file in the header of the import call but not sure how to do that as I see no reference to this in the documentation.  Before reaching out to support I wanted to see if anyone else has a solution to this?


Any suggestions are greatly appreciated!


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