Last year, it was reported that Samsung was planning to drop support for OneDrive backups in the Samsung Gallery app on Galaxy phones, as new strings were spotted stating that users would need to begin backing up photos to Samsung's own cloud service soon.
Now, Microsoft itself has confirmed that this is indeed happening later this year. Starting September 30, Samsung will cease to support OneDrive in the Samsung Gallery app on Galaxy phones, meaning from that date onwards, OneDrive will no longer be the default cloud provider for photo backups on Galaxy devices.