With the new world settings UI, this pack no longer functions. Mojang does not provide a method of customization for the new UI, so there is nothing I can do about this. If you need to export or back up worlds, it is still possible to do so manually by accessing the save files in your device's filesystem. Instructions for this vary depending on your device, there are plenty of tutorials out there.
Unhides the export button on MCPE.
Scroll down to the bottom of your world settings to find these new buttons:
They generate a .mcworld file that you can share with your friends!
Must be set as a global resource.
This resource pack MAY NOT be distributed on other websites or apps.
This resource pack MAY be shown in a showcase video AS LONG AS you link back to this page (no custom download links).