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Let's say I have Major Ultra Magnus in bot mode and Private Firedrive on the field, with Firedrive having 1 health remaining. If I attack with Ultra Magnus and trigger his bot mode ability, which causes Firedrive to die and I put the Duo-Charge Electrostatic Photon Cannon onto Ultra Magnus, what happens? Does Ultra Magnus get the +3 attack for this battle? Am I able to scrap cards from my hand to increase said attack?

Major Ultra Magnus will get the +3 attack, but since the long-name weapon was attached after he began his attack, the ability will not trigger and you will not be able to scrap any cards to add to your attack.
Source: Wizards of the Coast (2019-05-17)    【Link to Ruling】
Tags: Private Firedrive, Ground Command • Artillery