I haven’t tried pausing a print to insert an object but I have tried to pause and swap colors.

My prints always fall apart at the color change / pause. I’m assuming it’s because the plastic cools during the pause – by the time I withdraw and extrude a new color the model has cooled too much for the new color to stick.

That’s just a guess, but it wouldn’t hurt to pause for as little time as possible while you insert your object.