Texted Pack Issue

I just resubscribed for realms+ and I was using the Muddle texture pack by Razzleberries and I replaced my old realms with a world that had that texture pack on it and it didn't transfer over and I've tried to activate it in the realm edit and that also didn't work but it activated previously and on regular worlds that aren't realms. Also that texture pack plays Christmas music and changes some of the names and textures for items but only in realms I don't know why but that's why I'm reporting this right🙂.

                                                      Thank you

                                                           Layla