I have created a few NFTs on jumpnet https://bit.ly/3xeOPHI my sister also http://cutt.ly/PnnB9UR in case someone wants to see it. But we have put 1 JENJ of purchase / sale or shipping commission. In opensea you can specify a percentage instead of a fixed amount. It would be nice if ENJIN took note and put that option as well. Greetings.