Pin Widget Not Working Properly – No Preview

Hi!
Hoping you can help. I found that Pinterest’s Pin Widget wasn’t working in my blog posts (I couldn’t see the pin pictures in preview and didn’t trust them to publish correctly) so I’ve just downloaded your plugin. I used the code as directed to insert a pinterest pin into the TEXT area of my blog post. The code looks like this: [pin_widget url=“https://www.pinterest.com/pin/329536897712297375/“]
I am still not seeing the pin when I hit preview – it’s just a blank space. How do I know if this will publish the pin correctly?
Is there some additional code or steps I need to take in order to see this in Preview mode?
Thank you!

https://wordpress.org/plugins/pinterest-widgets/