Never mind. I found the issue - there's a typo in the embed code. sorry!

Hi Abhinav, Thank you for your prompt response. I don’t see any error code in the debugger, but there’s nothing happened when clicking Apply button. There’s an existing Tag embed code. I tested several embed codes but only one embed code doesn’t work. Sincerely,SeulGi Kim

Hi, I am testing my Tag library so I've tried to replace embed code with AEP debugger - when I replaced the code and clicked 'Apply' button, it didn't work.