I'm not real clear on what you're seeing, but start at the beginning with "Manage Channels" and then go to "Preview and Update" for the channel in question. Choose "Package Upload" under "Preview and Publish". I've never tried to upload a new package from within static analysis.
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I have already uploaded a package successfully, and it looks like I can still do this from the page you mentioned. The problem is on the Certification Testing page, I want to run the test again but I can't since the button is disabled.
I mentioned that the Re-Upload button on this page is disabled as well, though I don't think I actually need that. I should be able to re-upload from the Package Upload page if needed.
I have completed Static Analysis without any errors, the only remaining steps in the publishing checklist are Monetization (just need to figure out the tax form stuff) and Certification Testing.