ok, I got your point here for uploading JPG later.
The adding metadata to EPS files is not a big deal when we have a small portfolio of some 100s designs. And when the numbers goes in 1000s or 10s thousand this is pain taking :)… I have all those metadata in JPG.
For now, I think I should wait until there is an update for it.
I know this thing may go in further development but my suggestion would be to keep it simple.. upload EPS + JPG or maybe a ZIP (EPS+JPG) and done.