Allo was the world's introduction to Google Assistant, and it seems that while the Assistant was destined for (far) greater things, Allo itself flew too close to the flame, and today that flame is extinguished. At the time, Google said that "given Messages' continued momentum, we've made a decision to stop supporting Allo to focus on Message". The mobile messaging service was hotly anticipated when it came out in 2016, but the slow addition of features and oversaturation of the messaging ecosystem doomed the app. Any media attachments you sent - such as pictures - will be downloaded in zip format.
On your Android phone, open Allo. Google addressed some of that with updates, but they were slow to arrive. The company has also said that this new feature will be on by default.
You can still download your chats from Allo, but you'll have to be quick. After opening the Allo app, head over to Menu and then tap on Settings. Allo can export your conversations as a CSV file.
Allo now joins Hangouts, Google+ and Inbox by Gmail in the Google graveyard.
"Export media" lets you drag down all your photos, videos and other data.
Google has ported many of Allo's popular features into the Messages app. Duo, the video chat app that launched alongside Allo, has been installed on more than a billion Android devices - that's ten times more than Allo.