Exception caught by image resource service

Hi everyone,
I have a issue when I send a fileMessage to sendBird, my DashChat not show image and print error notification:

HttpException: Invalid statusCode: 401, uri = https://file-us-1.sendbird.com/9575c2fd45a64003b9541a33c742682a.jpg

I open my picture by url and page show: Not authorized.

Can you help me, thank you.

try to use the secureUrl.