Secure folder is the app developed by Samsung for its samsung devices only. Samsung secure folder comes pre-installed in all Samsung devices released after Android 7 version.
If your Samsung mobile doesn’t have Secure folder pre-installed you can download from here.
You can download this app from the download link give below in this post.
Samsung Smart Switch Apk
Google Play Store Link
Google Drive Link
Here we have provided multiple download link for Samsung secure folder version 1.6.
But still you can directly install the latest version of Samsung secure folder app from Google play store.