The Load tab of Setup is used to load in various file types. The option at the top of the window allows you to choose your USB storage device to load from. If your USB storage device doesn't appear, tap Refresh.
The Filename, Size and Date columns, can be sorted, by tapping the column headers. The Date column is not shown on FLX S, as FLX S consoles do not have an internal clock.
On FLX, you can click on a file, and use the up/down arrows to navigate through the list of files. Hold Shift and tap the up/down arrows to skip through the list of files.