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At what point does the upgrade I chose to move to Chop Shop take effect? During the attack so I gain the possible effect for my current attack, or does the cards effect (additional attack, additional bold, etc.) not happen until the next time I attack with Chop Shop?

You would get the benefits of the upgrade immediately, with the exception of abilities that trigger from Chop Shop attacking, because that event would have already passed (i.e. Data Pad).
Source: Wizards of the Coast (2019-02-01)    【Link to Ruling】
Tags: Chop Shop, Sneaky Insecticon