Can published UGC items be configured to become limited?

I recently got a UGC uploader to upload an item for me as I plan to add a free UGC event to my game, only to then realise after that the item must be a limited to do this. Is it possible to configure the item to become limited after it’s been published, I made it on sale for about 10 seconds before taking it off sale so I’m pretty certain it’s not been bought yet, however my uploader says because I made it on sale it can’t be configured to be made a limited, is this true?