(In reply to comment #52)
$wgAllowCopyUploads turned on for Commons in
This feature is currently limited to administrators, via UploadWizard, from
Feel free to file new bugs if you'd like any of these restrictions changed.
And here is the new bug. Please assign the upload_by_url right to the image-reviewer group on commonswiki as well. At the moment only administrators on commonswiki have this right.