So I have been using unRAID for the longest....  Recently I started using /mnt/cache/custom again, and noticed a few things...

 

Before, I could not see /mnt/cache/custom under /mnt/user/ and now /custom/ exists in /mnt/user, what has changed?

 

I am using PlayOn and decided to switch the recording to /mnt/cache/custom \\tower\cache\custom\playon to be exact and it does not allow the app to write to it.  I can open the network share just fine from an Explorer window though.

Any folder created under /mnt/cache is a share and it will appear as a user share under /mnt/user, and it was always like that, it won't appear under /mnt/user0 since that excludes any cache shares.