Operation not permitted using createTempFile on 2 file android

got "Operation not permitted" when try to crate second file on android sdk 24. in the first one have no problem. all ready have permission in the manifest

code:

 fun createVideoFileName(): File? {
        val name = "VIDEO"
        val videoFile = File.createTempFile(name , ".mp4", VideoFolder)
        val audioFile = File.createTempFile(name , ".mp3", VideoFolder)
        AudioFileName = audioFile.absolutePath
        return videoFile.absolutePath
    }

manifest:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

if i delete "VideoFolder" in the second line it work and create it to tmp dir if i crate only first file it's work. if i using another dir it don't work

directory are exists

error:

W/System.err: java.io.IOException: Operation not permitted W/System.err: at java.io.UnixFileSystem.createFileExclusively0(Native Method) W/System.err: at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:317) W/System.err: at java.io.File.createTempFile(File.java:2018) W/System.er