Samsung Galaxy A71 was not there in the initial list of eligible devices for the One UI 2.5 update but the device is now receiving the update. The device is getting the One UI 2.5 update across various countries across different continents.
The One UI 2.5 update for Galaxy A71 comes with version number A715FXXU3ATI8 and weighs about 1GB in size. It also brings the October 2020 security patch to the device. You will get a notification when the update arrives to your phone, or check it manually by heading to Settings -> Software update. See the full changelog of the latest update in the below images.
The One UI 2.5 update brings a lot of cool features such as SOS location-sharing feature for Messages, Bitmoji stickers on Always On Display, and brings a lot of improvements to the camera application, Samsung Keyboard, and Wi-Fi connectivity.