Its to deliver to a company for QC, they will then be uploading to youtube.
I read something about vimeo and youtube recognising and adjusting for the video levels. I have just done a couple of tests uploading the file and it has darkened down again but there is a bit more magenta coming out now.
I gave the colorist the files and he graded with resolve. I am just helping to get the export settings right (he has been giving me resolve files and we have both been trying different export settings), as when we exported it seemed to look wrong.