Amazon Prime: How to Change Aspect Ratio Flags in Header for 2.35:1 Video

I exported a 2.35:1 film from FCPX and am trying to upload it to Amazon. The mezzanine file is failing, likely due to the fact this is a 2.35:1 file and apparently there could be issues with the aspect ratio header flags. Does anyone know how to check and if necessary, correct the header flags so this will pass Amazon Prime quality control? At this point I don't even know why the video file is failing but I'm guessing it's because of the non standard aspect ratio. Thanks.

I post everything as HD standard to Amazon and never had issues. That's an odd aspect ratio for Amazon, IMHO. I could be wrong.

2.35:1 and 2.39:1 are actually fairly common and current aspect ratios for widescreen film. If the project was edited and mastered in these aspects (as opposed to inserting black bars to make it that way) then you can test this on YouTube. Make it private to test if you don't want public visibility. YouTubes small window may show it with black bars, but when you switch to theater mode you should see the full video with the 2.35:1 aspect correctly displayed. If it works there, then likely Amazon doesn't support aspects other than 4:3 and 16:9. If it's not correct in YouTube, then provide details of the project setting used to create it.