Difficulty adding internal hard drive as Steam storage location

Completely new to Linux so I'll appreciate any help.
I am trying to select my internal hard drive as a storage location inside the steam client but every time I try a new "Steamapps" folder is created but not accessible by Steam (the drive is mounted as far as I can tell). I have successfully created an install location on an external hard drive and the primary location is on my SSD which has limited space.
I have recently wiped this computer and formatted the drives.
Thanks.

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Welcome @ConnorB to the community!