Here is how to upload TikTok posts to Facebook automatically, so that every time you post on TikTok, the post gets automatically posted on Facebook (and any other social networks you select).
Using OneUp, you first connect your TikTok account and Facebook account (and any other social network you want to autopost to):

Then choose “Cross-posting” from the Create A Post dropdown options:

Then choose TikTok as the “Post from” account, and choose Facebook (and any other social network you want) as the “Post To” account:

That’s it! Now moving forward, whenever you post on TikTok, it will automatically post to your Facebook account with 2 hours of the original post.
Or you can optionally choose to add a delay so that it doesnt post to Facebook until after a few hours or days.
Here is a video showing how the autoposting process works in OneUp:
FAQ
Does this work with both image posts and video posts?
Yes, OneUp’s cross-posting works with both image and video posts. If you post an image to TikTok, it will autopost the image post to Facebook. If you post a video to TikTok, it will autopost the video post to Facebook Reels.
If I add music to my TikTok post, will that music also be added to the Facebook post?
Yes, it will post the video with the music to Facebook.
So this works even if I post to the TikTok account from the TikTok mobile app?
Yes, this works regardless of whether you post to TikTok from the TikTok mobile app, from tiktok.com, or from a scheduling tool.
Does this work for autoposting from TikTok to multiple different Facebook accounts at the same time?
Yes, OneUp’s crossposting feature allows you to autopost from TikTok to multiple Facebook accounts at the same time.