There are tool tips on each of the controls to help if there is a question about the input.

The application saves your last inputs in the config file between sessions.  

Here is a screenshot after launch.  Note that the inputs reflect inputs from a prior session.

 

Here is a screenshot of the application while processing files.

 

Conflict Resolution:  If the file exists in the target folder, the application will check the file name and size.  If they match, it is assumed to be just a duplicate and the one in the target location is kept in place.  If the size doesn't match then you will be prompted to resolve the conflict with the following screen.