As a side note, should I have filled the pool overnight instead of during the day?

I know people say to fill while the sun is out to help it make the liner soft and stretchy, but in my case is that a bad thing?

I was just concerned with there being too much tension on the sides that seem to have "too little" material and them pulling from the bead receiver at those locations.

I am getting sun on 3/4s+ of the pool. One of the "short" sides is in shade and I can't do much about that, but the rest of the liner is all in the sunlight.