Working with USD scenes
Unchecking 'Load payload' defers the loading of any payload in the scene, this is useful for inspecting large scenes when loading all geometry isn't required.
Unchecking 'Open as stage' will load only scene layer properties and metadata, no geometry will be loaded. To load the stage after opening right click the file in the content browser and select 'Load as stage'
usdtweak is built on OpenUSD and supports all the main features and benefits of the schema, including composition arcs. To add a composition arc first a prim or child prim must be targeted or created in the scene: