You can download some video editing software on your mobile phone to make it. The specific steps are demonstrated by "Refresh Video Editor", as follows:

Step one:

First, you need to open the "Refresh Video Editor", find "Video Tools" at the bottom of the homepage and click to enter the video tools page.

Step two:

In the special effects editing module of the video tool page, find and click "Picture in Picture" to enter the video import page.

Step 3:

Click "+"to import the required video, click "×" to export and add the wrong video, or click the "camera" icon for live shooting. After the video is successfully imported, click Next.

Step 4:

The video editing page has three operations: sound, advanced settings and settings. To make a picture-in-picture, you need to click the "picture-in-picture" function in the advanced editor.

Step five:

After entering a new page, drag the progress bar to find the scene in the picture where you need to add a picture, and then click "Add".

Step 6:

Select the video or photo you want to add, and then click Finish. After selection, you can press and hold the video to move to the position to be added, press and hold the yellow icon to control the video size, and click "√" after setting.

Step 7:

Click "Add" if you need to continue adding videos, or click "√" if you don't need to continue adding videos.

Step 8:

After returning to the video editing page, you can click "Save Draft" to save the video locally, or click "Publish" to quickly share it with your friends.

Hope to adopt!