I have verified the bug that you initially outlined here. I have to thank you for taking the time to submit this information as with people like you engaging in support you are improving the quality of the free software.
The ignore url text area in the CDN Settings of the plugin should now properly be processing one URI to ignore per line. It accepts a single asterisk as a wildcard if you wanted to pattern match a partial filename , for example these two lines would work :
/wp-content/uploads/2023/06/IMG_6110*
/wp-content/uploads/2023/12/Screenshot-from-2023-12-20-14-04-13*
Please update your plugin to v1.66 and let me know if the issue is resolved for you. Happy to troubleshoot further if needed.