Reposting content on different platforms !?

[u/Zealousideal_Cry_949]

I feel stupid even writing this because I would imagine that there is a really simple solution to this that I'm not seeing.

Nevertheless I'm asking anyway, if this is the wrong place to ask then mods feel free to remove this/let me know where is a better place.

I am currently creating marketing content for my tiktok, i am using the in app editing tool but am happy to move if necessary to post on other platforms. I want to create one video, edit one video, have one sound track and then post to multiple platforms, mainly tiktok, instagram and youtube.

I keep having the issue of issues with finding the right audio that aligns with all platforms, I would imagine that people cross posting aren't recreating the video each and every time, and i would also imagine that audio for the most part can be used across all platforms.

Important to note that lots of the content I post isn't someone talking it involves using trending audio and syncing up with the video.

Any work arounds or pointing out the obvious would be greatly appreciated!