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"Ένωσέ τις και κόλλησέ τις" or "Ένωσέ τις και κόλλησέ τις μαζί"
Explanation: The last case I found such an expression it meant "Tack and stick them up anywhere you like" ("Ένωσέ τις και κόλλησέ τις όπου θέλεις"), meaning "tack the images and stick the printout anywhere you like". However in this case, to avoid possible image copyright violations by the user, I would 'stick' to the more general "Ένωσέ τις και κόλλησέ τις μαζί". It highly depends on the intention (usage) of this device or software... hope I helped a little bit.