Storage, Miscellaneous Files, System memory

[xCerberusx]

Setting>device maintenance>storage>sd card>three dots in upper right corner(storage settings)> select sd card> unmount>mount

 

[Kellj]

XCerberusx (or someone who can answer this): what does that action do? (mount/unmount)? Does it simply clear out unneeded crap in Misc/System storage?