Uploads an image to the currently active switcher.
- Image: The image to upload.
- Index: The 1-index based still index.
- Media Player Index: The 1-index based media player id.
- Replace Existing: If toggled, an uploaded image will replace any existing still in the media pool.
- Show Error: Stops shortcut execution and displays an error. If disabled, the result of the shortcut will be true on, false otherwise.
True on success. False otherwise. Error is Show Error is toggled.