Large og:imgae but Facebook shows small square instead

Question

We are using large image 1920x1080 but after sharing the URL on Facebook, it still shows the small square instead of large image.

We defined og:image

 <meta name="og:image" content="https://s3.eu-central-1.amazonaws.com/marketingminer-multimedia/link building průzkum mezi specialisty_1920x1080.png">

And tried the Facebook debugger (but not helped): https://developers.facebook.com/tools/debug/?q=https%3A%2F%2Fwww.marketingminer.com%2Fsk%2Fblog%2Flink-building-pruzkum-mezi-specialisty.html

URL: https://www.marketingminer.com/sk/blog/link-building-pruzkum-mezi-specialisty.html

What should be the problem?

Answer 1

Changing the Content-Type on S3 to image/png helped :)