Laravel AWS HTTP error

"message": "Error executing \"PutObject\" on \"https://s3.ap-northeast-1.amazonaws.com/((url here))/public-uploads/materials/files/46b3a6d0-98b1-11e8-9b7f-3dde9f768f7d/clearskinsecrets.pdf\"; AWS HTTP error: cURL error 60: SSL certificate problem: unable to get local issuer certificate (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)",
    "status_code": 500

I am getting this error in Postman when I try to save a file to S3. I tried to do this cURL error 60: SSL certificate in Laravel 5.4 but it doesn't work.

via Chebli Mohamed