I made a video of the problem and my temporary solution here: https://youtu.be/dnvLXOGe-28. The first part is shaky because I am trying to disconnect the lid with one hand. I do not know the technical terms but will attempt to describe the situation below.
The tank does not refill when I use this dual flush toilet. I have discovered that it will fill when I pull the plunger out and ensure it seals properly. How can I fix this permanently?
Tank reads: Impala Dual Flush 6208 Vitromex