I uploaded a video file by using stagedUploadsCreate and fileCreate mutation. Everything worked fine and I've seen the files I uploaded in the settings/file page on shopify. However there seems to be no way to change preview image of files. When I query files, I see they have preview object and from there I can get preview image url through originalSrc parameter.
I searched through admin api documentation, but can't find any solution that addresses my problem. There are ways to change product media preview image but that's not my case I guess. I there anyway to upload file with previewImage ?