Green x 2: I can't clarify but . . . Was he using GoToMeeting? There are several GoTo apps.
Screen Sharing for Online Meetings & More | GoTo Connect (click Products menu for the range of apps). Perhaps one is better for face and voice while another is better for simultaneous access to stored files. But to get the combination, perhaps the best option at the time was to maintain two connections, one through the app and another that's an ordinary mobile call.
Red: I don't think we can say that the return call was made around 10:19. If his call associated with the conference lasted 39 minutes beginning 9:17, then it was over at 9:56, after which he made the return call and visited the pharmacy, finishing at the pharmacy at 10:19. After that I understand he made another business call while driving home, before his text to FFC at 10:30. (Previously I miscalculated that his conference would have ended at 9:46*, which gave him rather too much time for the pharmacy irrespective of whether he was on the phone at the same time.)
*edited