The 23-year-old rookie is one of three quarterbacks to have been named on the NFC West side's 53-man active roster.
The seventh-round draft pick told the team's official website: "Coming in, it was a whirlwind, trying to learn a million different things. Coming in at first and having to compete at a position that I have never played against guys that have been playing it all their lives, that was tough.
"Once I started getting more reps at quarterback, I was able to be comfortable and do what I do, read defenses, deliver the ball and try to do whatever I can to help move the chains.
"Once I got a hold of the playbook, mostly just the things I've done all myself being natural at the position. I'm just glad I had opportunity to show the abilities that I have been blessed with."
Daniels started training camp working with the wide receivers and running backs, before featuring as a passer for the 49ers during their pre-season games.