Question / Help can I use an external audio card, record form line in entrances and mix it with my cam? OBS as a cntrol room with diferetn sources no t in the same lo

[Chino Chau]

1. I Have Scarlett 8i6 fromm FOCUSRITE and I would like to record a videowith the image from my cam + music playing on the computer. is ti possible?
2. can OBS recieve streaming from other sources as Iphones, Androids, or computers in a far location, mix them in and stream them together like a reharsal or a live show?