The File SOP is limited where it can only load a single File at once.
There are several workflows where your models might be split up into parts, or you might want to batch process a lot of files in a for loop easily.
You can separate and visualize the imported geometry easily with the Align and Distribute GameDev Tool
Force Reload all Geometry Files
Main Button you should be pushing. Pops up a file browser which will allow you to select several geometry files at once.
Output Source Path
SourcePath attribute to the imported geometry to identify which file the geometry originated in.
Toggle to colorize the different files
Multiparm that will be auto populated from the Load Multiple Button
Individual File Paths will be listed here and the ability to manually add more or remove some is available.