I have noticed that many Mac users with their latest FUJIFILM camera have a same question, “why is my mac not showing the thumbnail of my raw files” and some will answer “shooting in compressed raw, this happened”
But I would like to clarify that compressed raw file might be effected the thumbnail, but for those who’s using new model FUJIFILM camera and not shooting with compressed RAW on Mac, the correct answer is....... just because the camera not on the raw support list only.
P.S. running MacOS Catalina 10.15.6