In its latest update, Minecraft has made the storage tab useless, as it has removed its main function, which was to delete worlds, resource packs, and behaviors. This has become impossible due to the fact that we can no longer drag the tab down to access the interface for deleting additional resources. The bug is only happening in the mobile version. We simply cannot uninstall resource packs because of this bug, it is unfortunate.
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duplicates
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This issue is being tracked at MCPE-187962.