Transform

Enable this option if position, size and angle animations - including joint (character) animations - should be imported.

Pose Morphs

If there are morph targets in the *.gltf file, these can be imported here using the Pose Morph tag (option activated). The poses are then stored in a Poses folder, invisible in the Viewport and renderer, but are linked in the Pose Morph tag as absolute morph targets. Any animation tracks will be adopted.

Pose Target Layer

The Poses folder, including the morph targets it contains, is assigned to a layer when this option is activated. The poses can then be hidden quickly and easily using the Layer Manager in the Object Manager: click on the icon under "M".

Clean Tracks

This option corresponds to the Timeline command of the same name Clean Tracks. When importing, many adjacent keys with the same key values are reduced to the first and last of the identical keys.