I have the S7 Plus and on the Play Store it says the last update was June 2020 but the version number in app setting reads "Version 2020.11.29.346182102.Release". I assume this means it's a release from Nov 2020.
I don't have auto update enabled, I just check regularly and manually update other apps offered with an update. No updates offered for Gmail and play store only offers the June 2020 version. Other Samsung devices I have get regular Gmail updates.