This is a yielding function. When called, it will pause the Lua thread that called the function until a result is ready to be returned, without interrupting other scripts.
This member cannot be used in scripts, but is usable in the command bar and plugins.
Opens a window in Roblox Studio, which prompts the user to select an asset based on the assetType specified. Returns what assetId was selected, or -1 if the window was closed.