<img src="pro://msc_itc.png" width="50%">
As already assumed above, you have stored the image in the protected file storage (checkbox before uploading the file).
"Protected" means the only people who are doing a interview will have access to the file. And only during the interview.
When the language is chosen, the interview has not yet begun. And when the "last page" is reached, it is already over.
The solution is simple: It seems that you do not worry to much about people seeing the image. Because they would only have to click the survey URL to see it. Therefore, just upload the image without setting the "protected storage" checkmark, and then remove the
pro:// from the HTML code.