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Similarly, let's say I have Optimus Prime - Battlefield Legend on the field in Bot mode and during my attack I flip a Quartermaster to bring back the Duo-Charge Electrostatic Photon Cannon and put it onto Optimus Prime. For that battle, does Optimus Prime get +3 attack? Am I also able to scrap cards from my hand to increase the attack?

Optimus Prime - Battlefield Legend will get the +3 attack, but since the weapon with the very long name 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