The log file and the data file are two different things, but either way, for things you do manually in code, you need to record info explicitly yourself, as Builder doesn’t know anything about these custom-made objects or what you want done with them.
e.g. to save something in the data file once per trial, put something like this in the “begin routine” tab:
thisExp.addData('image_file', targets[trials.thisN].image) # or .name or whatever