As Samsung Messages does not have any backup feature nor any ability to send messages from PC/MacOS, I have tried using Google Messages, PushBullet and others.
When another app such as Google Messages is set as the default SMS app or has permissions to send and receive SMS messages, I can view the entire history of messages received on my phone. Messages previously sent from my phone, however, do not show up in Google Messages nor in PushBullet.
Why can't these messages sync with other apps?
Is there another way around this or any other way to fully backup my SMS conversations?