Internal storage sd read in laptop: where are the files?
SD cards used as internal storage on Marshmallow devices are encrypted, you cannot read them in a computer, or any other device under normal conditions.

There are articles about how to extract the encryption key from the phone and use it to mount the encrypted file system in Linux, but it is still not perfect. https://nelenkov.blogspot.com/2015/06/decrypting-android-m-adopted-storage.html