Update (12:50 p.m.): In an interview with Beats 1's Zane Lowe, Sia said This Is Acting contains songs written for Beyoncé and Rihanna, amongst others. She also said she's working with FKA twigs, and that she has a song on Adele's new album.
So I tried looking for the interview but I can find it because its on Apple Music or w/e. I have seen reputable members back this claim on that Sia did say this during the interview. So it seems like Sia and Adele worked on MORE THAN three songs, because she is probably referring to a fourth song that was not in the time line (two days) that she mentioned in the Seacrest interview.
Anyways super excited to find out one of her songs made the album Also the fact we will get to hear the rejects which will be on Sia's album is really exciting
Also the fact we will get to hear the rejects which will be on Sia's album is really exciting 
