Network stations Y and Z, cannot get Z on ios phone (only Y)

I bought the WD My Cloud 3 TB and did upload my family pictures on it.
It was stored on Public… My PC recognizes this also as station Z. It works fine on my PC.
Later I tried to use My Cloud app on my iPhone and it created station Y, while all data is on Z.
I can upload and download photos through my phone on Y, but not on / from Z.
Uploading pictures to Y by iPhone is going fine.
On my iphone I cannot reach the data on station Z ?
When I use my PC I can access both Z and Y.
I only want to use station Z.
Suggestions ? (copying everything from Z to Y maybe ?)