The Aplication can't find the obb

My Aplication can't see the obb file after install - it can find it only after device system reload

but I can see it on such directorys by any file manager:

storage/sdcard0/Android/obb/

storage/emulated/legacy/Android/obb/

storage/emulated/0/Android/obb/

I use this path to find obb:

var path : String = "Android/obb/air.AppName";

var filename : String = "main.1000000.air.AppName.obb";

var file : File = File.desktopDirectory.resolvePath(path + "/" + filename);

so why aplication can't find it ?