Download worlds for mobile Minecraft bedrock

A future where players of mobile can download their worlds also transefering their world from application to external and also the opposite. Some players had used a texture packs or addons to download their worlds but unable too because it wouldn't work in the new update. Also risking deleting their world when they deleted Minecraft on application. Some method by acsesing the filles of the app but some can't because limited by google or their device restricted access by the parents.