Blend Mode - set the blend mode for the layer.
Alpha - set how opaque/transparent a shape is.
Image - Drag in an image file from the Asset Window.
Scale Mode -
None - do not scale.
Fit - fit the image to the Shape based on the longest edge whilst retaining the aspect ratio of the image.
Fit Horizontally - fit the image to the Shape's horizontal edge whilst retaining the aspect ratio of the image.
Fit Vertically - fit the image to the Shape's vertical edge whilst retaining the aspect ratio of the image.
Tiling - determine what happens at the borders of your gradient.
Clamp - use the first and last values of your gradient.
Repeat - repeat/ loop the gradient.
Mirror - mirror/ ping pong the gradient.
Decal - cut out the gradient.
Scale - increase/ decrease the scale of your image.
Offset - offset the position of the image.
Looping - when checked an Image Sequence will be set to infinitely loop.
FPS - set the frame rate an Image Sequence will play back at. By default this control is connected to the composition's frame rate but you can manually set it by removing the connection.