Hi CaB! The sheets are not set up to account for all types of interaction. The Bracers of Archery don't "know" what is an archery attack vs any other type of attack. Part of this is due to the system agnostic nature of Roll20. There's only so much automation that can be done and still make a site that can account for the hundreds of systems that are played on it. The sheet can account for many global things, such as increasing the character's AC total, or their Saving Throws, but it can't account for special cases, such as "+2 on Con saves vs. poison", or in your case, "+2 on damage rolls from bows". This is one of the things that must be done manually. You can either edit it into your bow attacks, or set up a global damage modifier that you toggle on and off depending on the attack.
