When I click on the data integrated by simbrief in the menu which appears when the underground tank truck arrives, nothing happens.
You are not supposed to see that page, because in our internal config, the PMDG is flagged to use its own internal fuel system so you must have changed it, but you shouldn't, because the PMDG MUST be refueled by itself!
Yes, if you want to see the animation, you can move out the refueling point high enough but mind, that height depends on the airplane weight. Internally, is stored in relative units from the airplane static CG but, so the weight when you edited it doesn't matter but, if the airplane the 2nd time was heavier than the 1st time, the refueling point might have be just below the 3.40 threshold, so there will be platform raising and no crew animation.
But don't worry, we ARE working on a new animation which will be used with all planes lower than 3.50 mt. and will be so good you will never want to use the platform again...