In the properties menu of the Assets window you have a couple of options that are useful.
FileWatcher
FileWatcher is a LightAct feature that monitors the asset repository. If enabled, the moment you copy an asset into the repository, it will be ingested into LightAct.
Good to know: if you want to have manual control over when to ingest assets you will want to disable that.
Get data
Get Data function reads the Asset and makes it ready to play.
Before LightAct reads the Asset it won't be able to play it.