Embedded data - persisting to end of survey

I have developed a survey in qualtrics where the questions include some interactive experiences. I developed the interactive experiences within qualtrics using css, html and javascript. Now I want to collect backend data about the usage of various interactive elements as the users are going through the survey. I can successfully collect the backend information within a given question. However, I cannot get the values that I have collected to persist to the end of the survey. I have tried using embedded data and overwriting the timing variables but I cannot get the values that I set (using the qualtrics setter function) to persist to the end of the survey. I am happy to post my code but this seems like a pretty straightforward use of the embedded data. Does anyone have any suggestions? Thanks for any help!