How to use macro in Simulink

Tried CUR_DIR = pwd;

In Matlab I can do >> ls(CUR_DIR); I can strcat to for a file name and operate on the file.

But In Simulink I was trying to use the same method to get "Image from File" block to import a image from this relative path. The block complains "The specified file does not exist in MATLAB's search path".

Not able to dereference a file from a variable.

All I want is ${FILE_NAME_WITH_PATH} to use in simulink so I don't have to be locked by absolute path.

Thanks,