The loaded text itself is "as is". It is not interpreted like the text typed in the PSM text boxes.

Inside the same text box, you can however have multiple variables, making it possible to load multiple text files inside the same box. This way you can mix loaded text files with normal variables.

Note: after loading a text file, the next variable will start on the next line. A text file can however be loaded starting on the same line as a normal variable.