I use a 6s light for school. I download all my files to my one drive then open them on my tablet and press open into another app. It was opening to Samsung notes but now they are all opening up in Microsoft 365 and I can't figure out how to change it back.
Go to Settings >> Apps >> Microsoft 365 >> Set as default .
I think there should be clear defaults option. After you clear it, when you open files like pdf, it will ask "open with" so you can select Samsung Notes and tab Always. This will set Samsung Notes as a default app.
