Hi! I'm trying to work with an HEVC file, filmed by an Iphone, in FCPX 10.4.3 and Mojave installed 1 hour ago. The graphic card is an RX580 Opening the file in Quicktime or in finder or VLC, all is OK, but... If I import the file into a project in FCPX, I hear only the audio, then it freezes and beach-ball...and force quit is the only solution. Why I can see the video in quicktime but NOT in fcpx? I had this problem in High Sierra but I thought that it was caused by non-supported-card...now the RX580 is Mojave full-support, so it's strange this error! Can someone with a Mac Pro 2009 + rx580 give a look and try if has the same problem? Thank you!