Well, I did quick test with Ejecta..
I get only errors
I tried to make an archive:
pic 1: "https://www.dropbox.com/s/gdxbcncezl5p9tk/1TV.jpg?dl=0"
Then I delete from target this..
pic 2: "https://www.dropbox.com/s/3if9jrquc549rld/2TV.jpg?dl=0"
..and build succeeded. Then I tried to download the archive to iTunes Connect, and...
pic 3: "https://www.dropbox.com/s/99c1ysq505ngu6o/3TV.png?dl=0"
Heh. Maybe someone smarter than me makes it works and write an tutorial?