Why not just "install" it from the Play store over a WiFi connection, and let it look after where it puts the file, rather than trying to manually copy the file across and making sure it's in the right place, properly registered with the app, correct version, etc. (The large obb file was modified in a recent update, so you may get a corrupt installation with an out-of-date obb file, even if you put it in the right location.)
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