When you modify a PSD file (in Adobe Photoshop) that is connected to a Maya PSD node (in Maya), you can update (refresh) the image in Maya to show the modifications immediately.
To update a PSD texture in Maya
Most of the File Attributes are the same as Maya’s File Texture Node; see File for details.
For more information, see Disable the initial load of a file texture image.
See Use Image Sequence.