I downloaded Clop after rave reviews, bought the pro version, loaded it onto my macbook pro m4, and the problem started there. While i could drag and drop videos to a dropzone to be optimised, i could access no other functionality to customise the use. I contacted the developer who gave me a few things to try, which did not work. He refused to help me trouble shoot any further. Had he ****isted me, i would have bought 15 to 30 more apps for my staff in my media company to use, but that wont be happening.