When I look at your videos, it seems to me, that you do not hold the thread end with your finger when you start the stitch. You always need to do that. Normally a needle plate and fabric is needed for a proper loop to be formed in order for the hook to catch the needle thread. You may be able to catch the thread anyway, but it is harder for the machine this way.
And yes, as Appin write, you have got a class 15 bobbin in. It should be a class 66 bobbin.