Simply put, I am trying to crop videos taken in 16:9 format into a 9:16 format for Instagram Reels and YouTube Shorts.
First, I made the video as normal (with the project aspect ratio still 16:9), individually cropping each clip to a 9:16 format and adding text overlays. I was very happy with how it turned out. I didn't realize until after completing and exporting that the black negative space was still on the sides of the video and it saved in the 16:9 format (I thought it might give me the option to be 9:19 at export).
I first tried going back into the project and just changing the whole project AR to 9:16. But that just shrinks the video and adds even more dead space (see the first attached image). Even if I go into each clip to individually crop it again, it's very meticulous and the snap-to lines aren't showing up, and it looks like it reduces the quality a lot (second attached image). But let's say I ultimately clip it to the way I want, when I go back to the main screen it inexplicably stretches the image in a way I didn't intend (third attached image).
My next thought was to take the fully exported video (that was in 16:9) and make a new project, setting that project to 9:16, and cropping the full video as necessary. Should be easy enough, right? Well, when I try to add the video, I get the message in the fourth attached image. I don't want to change the AR, so I click "no", and it gives me a similar massive dead space issue (fifth image). What if I try now cropping this fully-made video like I did all the previous videos? This should definitely work, and it looks promising (sixth image). But I press OK, and it goes back to the exact same thing as in the third image.
My last thought was just to re-make it from scratch, but I immediately ran into the same problem as the previous attempt when I tried to individually crop the videos.
What's even weirder is I sent the video to my iPhone, which has a native video cropping feature. I crop the saved video to 9:16, but I get a message saying it's unable to save my video. No other edit causes this problem. I tried uploading it to Instagram hoping it would auto-crop for me, but it just leaves a ton of negative space. I've been able to auto-crop every other Instagram Reel I've posted!
Theoretically, it should be extremely easy just to trim the sides off the video. Why, why, why is this so difficult for this video? What am I missing or doing wrong?