Out of the box a Samsung phone is typically set up to reject downloads from unknown sources @hdmobia
i.e apk files.
A person can turn that safety setting off but please be careful when downloading apk files as they can have security risks and cause stability issues.
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.