FBX Importer using python api

Options

options = unreal.FbxImportUI()
options.automated_import_should_detect_type = False

options.import_mesh = False
options.import_as_skeletal = False
options.import_materials = False
options.create_physics_asset = False
options.import_textures = False
options.import_animations = True  # Animation only

options.mesh_type_to_import = unreal.FBXImportType.FBXIT_ANIMATION
options.anim_sequence_import_data = unreal.FbxAnimSequenceImportData()
options.anim_sequence_import_data.set_editor_property(
    "import_bone_tracks", True
)

options.anim_sequence_import_data.set_editor_property(
    "import_custom_attribute", True
)

# unreal.FbxAnimSequenceImportData
options.anim_sequence_import_data.set_editor_property(
    "animation_length",
    unreal.FBXAnimationLengthImportType.FBXALIT_EXPORTED_TIME,
)

Custom Framerange

if (start_frame + end_frame) == 0:
    # No frame range so we keep the default
    return

self.options.anim_sequence_import_data.set_editor_property(
    "animation_length",
    unreal.FBXAnimationLengthImportType.FBXALIT_SET_RANGE,
)

range_interval = unreal.Int32Interval()
range_interval.set_editor_property("min", start_frame)
range_interval.set_editor_property("max", end_frame)
self.options.get_editor_property(
    "anim_sequence_import_data"
).set_editor_property("frame_import_range", range_interval)

Task

task = unreal.AssetImportTask()
task.set_editor_property("automated", True)
task.set_editor_property("destination_name", name)
task.set_editor_property("destination_path", dst_package)
task.set_editor_property("filename", filepath)
task.set_editor_property("replace_existing", True)
task.set_editor_property("save", save)
task.set_editor_property("options", options)

Execute

tasks = [task]
unreal.AssetToolsHelpers.get_asset_tools().import_asset_tasks(tasks)
imported_asset_paths = []
for task in tasks:
    for path in task.get_editor_property("imported_object_paths"):
        imported_asset_paths.append(path)
print(imported_asset_paths)

import animated SkeletalMesh to sequencer

# Create Sequencer
assetTools = unreal.AssetToolsHelper.get_asset_tools()
sequence = assetTools.create_asset(
    asset_name="mySequencer",
    package_path="/Game/",
    asset_class=unreal.LevelSequence,
    factory = unreal.LevelSequenceFactoryName()
) 

camera_cut_track = self.asset.add_master_track(unreal.MovieSceneCameraCutTrack)
camera_cut_track.add_section()


#...
# You can get it like this or just use the new one 
level_seq = unreal.load_asset("/Game/path/to/sequencer")
animated_sm = unreal.load_asset(
    "/Game/path/to/animated_sm"
)

sk_binding = level_seq.add_spawnable_from_instance(animated_sm)

# Add animation to our actor
anim_track = sk_binding.add_track(unreal.MovieSceneSkeletalAnimationTrack)
anim_section = anim_track.add_section()
start_frame = level_seq.get_playback_start()
end_frame = level_seq.get_playback_end()
anim_section.set_range(start_frame, end_frame)
anim_section.params.animation = animated_sm