There are a few things you need to know if you want to run an action in Photoshop. First, the action must be named after a file name. For example, “MyAction.psd”. Second, the action must be placed in the same Photoshop document as the image or video you are working on. Third, the action must be enabled by default. Finally, the action must be run by pressing the “run” button in Photoshop.