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Samsung devices don't support Adoptable Storage. However, there is a workaround with ADB (root not required). Here are the commands for ADB:

adb shell
sm list-disks
partition <DISK> private
reboot

Notes:

1. <DISK> needs to be replaced with the output of the previous command. For example partition disk:179,64 private.
2. If you don't want to convert the whole disk, then use this command instead: partition <DISK> mixed <VALUE>, where is the percentage (0-100) to keep as external storage. For example partition disk:179,64 mixed 50 for 50%.
3. Reboot is optional, but recommend, so all apps detect the external storage.

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If you have root access, you can use my app [Root Essentials][1] instead. It can do all of this automatically without a PC or terminal commands.