Where can I see the sent, draft and outbox messages ? Or are there folders such as Sent, Draft and Outbox in the built-in Messaging app on my Xiaomi device ?
The built-in Messaging app groups all sent, received and even draft messages by contacts. This is how the app works, and I believe there’s no way you can change that to a non threaded format such as having the messages organized in Inbox, Sent, Outbox and Draft folders.
In short, communicating using the Messaging app is pretty much similar to having instant messaging (IM) conversations.