How to import product name with ™ and ® symbol?

Pretty sure it's caused by the fact that those characters are not supported when copied/pasted like this.

I reckon you should use their HTML equivalent instead:

• ™ : ™
• ® : ®

The W3C provides a nice character entity reference if you need to find out more characters: https://dev.w3.org/html5/html-author/charref