An MP4 in, vertical MP4s out
Zoom's recording is an MP4, one of the three formats accepted, and up to 2 GB fit in one upload. Each short is an MP4 you can upload to LinkedIn as a native video, in 9:16 at 1080 x 1920 or 4:5 at 1080 x 1350, and the 9:16 file also goes to YouTube Shorts, TikTok and Reels.