Update: Work-around if no save can be found in the dirs box can be found HERE.
a- This will not work with PS4 Save Wizard saves that you download from the net because they are encrypted unless you have access to those saves to load on your PS4 to decrypt, encrypt, edit or swap region.
b- You need a jailbroken PS4 for this to work.
c- Swap region works on every game I have tried not sure about all games yet need more testing.
d- You don't need any other tool to decrypt or encrypt the save the tool will do it for you.
e- Very important please always make a backup of your save.
f- I used Al-Azif Offline PS4 Exploit Host v0.4.6 Alpha1.
g- Use ChendoChap PlayStation 4 Save Mounter v1.1.
h- Make sure that you have a working save, in my case I have good save Bloodborne CUSA00900 v01.09 and its on my PS4 slim that I want to decrypt, on the other hand I have a dummy save for Bloodborne CUSA00207 v01.00 on my PS4, you don't need 2nd PS4.
i- Make a note of your PS4 IP address.