New footage from Amazon Prime Video's fly-on-the-wall documentary, 'All or Nothing: Arsenal', shows the extent of the problems with Aubameyang.
Aubameyang was stripped of the captaincy and eventually moved to Barcelona in the January transfer window.
Speaking to Arsenal's media, communications & community affairs director after a press conference, Arteta says: "That's why I have everything documented, with the dates, the times, the conversations, how it happened, why it happened… because if one day, if one day it's needed.
"[Aubameyang] has been late, apart from all the [other] issues, many times. The club has got a tradition. When you get paid that much money…"
Arsenal's technical director, Edu, and the director of football operations, Richard Garlick are then seen on the phone with a club lawyer after Aubameyang was told to train away from the group.
"Mikel has got a file," explains Garlick. "It's a catalogue of misdemeanours that he has had, which has culminated in this."
The episode also shows the moment when Arteta told his squad that Aubameyang was no longer their captain.
"The club and myself, we are not going to accept any behaviour like this," says Arteta.
"And what we are building goes completely against any behaviour like that. So if we have to have any meaning for changing our culture and making sure that we become a different club and team, we have to stand to those words, clearly in every action with anybody.
"This is the message that I have to send you. I don't like the timing but I had to clear that up with you guys."
Asked when was the moment he knew Aubameyang couldn't be part of the team, Arteta said: "When I looked in his eyes and I saw and I felt what I felt, that that level of trust was gone. That day.
"It is a really difficult decision to make in the middle of the season and with the most important player at the club, and then with the impact not having that player could have on the performances of the team.
"But, if you put all these ingredients together and still the decision is clear, then you have to make it."
He added: "At the end, rules and discipline brings clarity, because at the end you cannot measure trust.
"When you look at the eyes of that player and you believe that's gone, and that's a really difficult point to get something back from it.
"My memories of Auba are all the exceptional moments. I didn't want to finish like that because, first of all, I think Auba deserves something better and the club as well. But it could not be, in my opinion, any other way."