The app export installed apps to your sd card. SD-Card has priority. If the sd card is not available, there uses internal download folder as destination. If you do not want to export .apk file to sd card, eject the card. The app is simple and makes only one job: “export installed app, if the .apk file is available on your device”. Not more!
Not all apps can be exported!
Not all exported apps can be installed!
Not all exported app if is installed works!
If you don’t understand that and accept, not install this app! I have tested it with different devices and apps. If any installed app don’t have V1 and V2 signature, it can be exported, but maybe can’t be installed.