Evolution Temple bug?

[Skracher]

Have noticed that lately that my evolve button is greyed out. Nothing in the temple and I have fed them up to the point I should be able to evolve and trade them but not working. Have shut down phone restarted etc.. Anyone know whats up?

[[S8] Elsa]

Hi, Skracher. If your Dragons are exhausted from the Battle Arena, you'll need to heal them first. Exhausted Dragons have the little Z's on their frame.