Hi! Let me try to explain how to make a timer for a video.

Actually u don't need to use Livesplit or something else, because u can't pun autosplit on game. For submit, record ur run, add a time according to the rules of the category and submit. To add a timer, try to use Vegas Pro (guide here https://www.speedrun.com/r6_siege/guide/3d7d6 ) or another editing software (like Shortcut, Adobe Premiere Pro). That's all!

But if u run All Situation, u can use LiveSplit for orientation. Splits u can find in resources. Gl hf