The fix is in Katello, so I'm changing the component.
Verified on snap 14, manually uploaded packages are visible in the ui, see attachment
Created attachment 1322258 [details] screenshot
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. > > For information on the advisory, and where to find the updated files, follow the link below. > > If the solution does not work for you, open a new bug report. > > https://access.redhat.com/errata/RHSA-2018:0336