Hi there,

I have tested this locally and it is working correctly on my end. Maybe it would be best if you share to us your pinterest link you wanted to share for further check on this issues. Those url i used is as follow
https://www.pinterest.com/pin/136445063682195390/

Note:
You have to share exact pattern stated on the placeholder as shown http://take.ms/AttMa in order for you to be to use this block.

Please advice.