What it is

Samsung Gallery app (https://play.google.com/store/apps/details?id=com.sec.android.gallery3d)

Note: Samsung Gallery is a dependency for the camera so it's not a good idea to delete it.

Note : Good to know. When the original version of the image is deleted, the copy of it within the com.sec.android.gallery3d folder is not removed.

https://athenaforensics.co.uk/com-sec-android-gallery3d-mobile-phone-forensics/

NOTE : Deleting this package will also prevent to preview photos from the camera app.

Commands

adb shell pm uninstall --user 0 com.sec.android.gallery3d

To put it back:

adb shell cmd package install-existing com.sec.android.gallery3d

Every removal listed here is per-user only: the system image is untouched, and the restore command puts the app back from the copy already on the device. Nothing is downloaded.

This is not the directory. Here we say what a package is in general; what happens on your particular television is on your model's entry, and that one wins. The same package can be dead weight on one set and hold the home screen up on another.