Thanks for reaching out to the Samsung support communities! We would like to inform you that kindly update the whatsapp application and reconnect the Gear S3 with the device and check the issue.
Be sure to hit ♡ when you find an answer that works for you. For Further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
After recent update to whatsapp version 2.18.65, the option to reply to last whatsapp message from Gear S3 is lost. Reply options says "check your phone". Multiple users are facing this issue. Please check below link: https://www.google.co.in/amp/s/forum.xda-developers.com/gear-s3/help/longer-reply-whatsapp-messages-t3757536/amp/
