By default, non-native art is labeledin the Layers and Appearance panels. You can select, move, save, and perform basic transformations [such as scaling, rotating, or skewing] on non-native art. However, you cannot select and edit its individual components. In addition, you must rasterize non-native art before editing it with the liquify tools.
To convert non-native art to an Illustrator object, choose Object> Rasterize.