i imported a 4k 10 bit 4.2.2 hevc file from my fuji xt3 and now when i want to render it to a 10 bit 4.2.2 h.264 MP4 i see the chroma sub sampling options dis highlighted.....can someone tell me how to get those un-dis highlighted so i can render my file as 4k 4.2.2 10 bit MP4 H.264? im using V pro 17