Second attempt worked fine. I think I must have clicked the 'Upload Freestuff' button and not the 'Upload Item' button (see screenshot below). I think that having the 'Upload FreeStuff' button top right on the "Upload Freestuff" page is counterintuitive. Once I've filled in the data for my upload I usually scroll back up to check that I've filled everything in correctly, and of course the 'Upload Item' button has scrolled off the page. I then see the big green 'Upload Freestuff' button and click it, because that's exactly what I want to do, upload freestuff. But of course that'll take me to a page for entering data for a new freestuff item - it won't upload the freestuff item I've just set up the data for...

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).