This is a very intuitive plugin. You can view thumbnails of the frames of an instance contents. Clicking on the thumbnail, it changes the drawing (first frame property).

Speeds up to 80% lip sync animation and stock model based characters. For example, you can build a symbol with a different mouth in each frame and change it on stage by clicking on the thumbnail.

The mouth drawings on the left is just for illustrate the plugin. The images will be loaded from your own symbol.

Loading Thumbnails from your Symbols

Open the Plugin by clicking Window/Other Panels/[T] Thumbnail Plugin.
Select an object on the stage. This object must be a 'graphic' instance.
Press the Load thumbnails button.
You can choose between 3 thumbnail sizes by clicking on the size bar (see on the left).

Changing your Drawings on Stage

Select an object on the stage. This object must be a 'graphic' instance.
Click on the thumbnail you want.
If you prefer, you can activate the preview option, which changes the drawing on the stage by rolling the mouse over the thumbnails.

TIP: Prefer to use the instance in single frame mode.

Changing your Drawings on Stage Using Previous and Next Button

Select an object on the stage. This object must be a 'graphic' instance.
Press the Previous or the Next button. Your drawings will change frame by frame.

Learn how to assign a hotkey to this button.