Thank you for responding. yes, I read it. I cut and pasted some of it in my question. Since it says I need to use mp4 or h.264 I tried converting my files to both these formats and testing lossless export before asking my question because I respect people's time and am grateful for any help.
Since I'm using H.264 and MP4s, why won't it let me use lossless export?
Thanks again!