Can't access trello card images publicly

Hi there,
I’m using Trello API for get card attachments, with API response we used to get card images from most probably aws and I could access those images at any condition logged in or logged out.( we used to get card image URL like this - trello-attachments.s3.amazonaws.com*********)
Recently I’m not able to do this, I’m not getting the same URL and couldn’t access images from anywhere we want. (We are sending Trello images through email to the customer)
Now attachment API giving response like this (https://trello.com/1/cards/613045d422b04355c633730a/attachments/)
Do you guys any idea how can solve this? Or any alternative solution?
We can do that by making the board public but this is not secured for us. We used to get the perfect result before from private board though.

Hi @saiful96 - welcome!

Have a look here at the latest announcement regarding authenticated access to S3 objects (attachments).