First, open the Tik Tok APP, as shown in the following figure:

Second, find the video that needs to be co-produced, and click the sharing option below, which is the arrow option, as shown in the following figure:

Third, after clicking, you can see that there is a co-production option below, just below. Click Co-production, as shown in the following figure:

4. After clicking, loading will be displayed, and when it is loaded to 1%, as shown in the following figure:

5. A co-production interface appears, with our video on the left and a co-production screen of our own choice on the right, as shown in the following figure:

6. Click the red button in the middle to start recording, so that the video is recorded, as shown in the following figure: