In order to add images for "Splash Screen" you need:
- Go to the "Media Gallery" page.
- Choose the "Splash screens" tab.
- Click "Upload new".
- Click "Choose a file".
- Choose the desired image. (Recommended minimum resolution for this type of images is 2436x3840px).
- Choose desired part of the image on the canvas from the left. (Depending on the aspect ratio and image size, some settings in the canvas may not be available).
- Click "Upload".
If you click on the appeared image, you will see settings window from the right side. Here you can "Rename" and "Remove" the picture.