Youtube preset subtitles

I'm using the Youtube preset on my Mac with DaVinci resolve 16. My video has a subtitle track which shows fine when I playback the video in DaVinci. When I export, I use the Youtube (1080) preset. There is no option for subtitles and when I view the video on my mac, the subtitles are not visible. Am I doing something wrong or will the titles appear as Youtube subtitles after I upload?

Ok, so I got around this by using a 'Custom' rather than the youtube preset and just making sure all the video and audio settings were the same as the Youtube preset. It's a bit silly though, If I go to 'Custom' and select 'Export Subtitles' - on. then flip to the Youtube preset and back to 'custom'.... the Export Subtitles is now off. doesn't make any sense to me but I'm out of trouble anyway.