I cannot know you the version of your cloud deployment. It would be great if you could post it here. Anyway, there is a video when you click on show answer after "d. Upload the data". This video should make it clear what needs to be done. I managed to ingest the file just now.
The UI changed a bit, but not that much. The following screenshot should help you find where you need to go to import the data. Let me know if you need further help:
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