I have encountered this problem before, and it is quite easy to solve it. Next, I'll tell you how to operate:

Tool: VIVOY73s cutting 6. 10

Step 1: Click Edit the imported video material in the mobile phone clip, locate the position where the frame needs to be added, and then click "Clip" in the lower left corner. (as shown in the figure below)

Step 2: Click Split and click the "Split" option. (as shown in the figure below)

Step 3, click the plus sign, and click the plus sign on the right side of the video material. (as shown in the figure below)

Step 4, after selecting the video or picture needed for frame patching, realize the effect of frame patching. (as shown in the figure below)

These are all the steps to solve the problem of how to fill the box in mobile phone cutting. Remember to like it for me if it is useful to you ~