First, select the sub-screen that needs to be set

Material editing is concentrated in the bottom area of the program editing interface. To add materials, click the add button in the upper right corner of this area

Here, we take adding an image as an example. In the pop-up dialog box, select Image

Then, in the pop-up dialog on the right, click the add button. There are multiple image sources available. By default, images are selected from the online My Gallery. If you need to choose images from your computer or phone, you can click the "Upload" button in My Gallery to upload them

After selecting the material, click the "Confirm Selection" button

Return to the main program editing interface. When there are any changes to the program, the save button will appear. Click the save button to save the changes.