Usman Haider, before creating new worlds, make sure your storage is set to “External”. This way, you'll be able to access those world files in Android/com.mojang.minecraftpe/files/games/com.mojang/minecraftWorlds
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This won't help existing worlds, but will help for the new/future worlds
This really needs to be fixed. I can’t believe this only has 2 votes. This is an incredibly important feature that is lacking, and there’s no way to bypass this issue even with ADB and plugins which can no longer work as the API for changing the Minecraft GUI was forgotten about when the redesign was shipped.
Did you turn on the experiment when creating the world?