upgraded on storage of iPhone 6 [duplicate]
Solution 1:
Your phone still has only 16GB of storage. You probably purchased a 200GB iCloud Storage Plan. While this does not give you more actual storage on your iPhone you can do things like enable "iCloud Photo Library" in your iCloud settings and enable "Optimize iPhone Storage".
That way not every photo is stored locally on your phone in full resolution and therefore saves space on your phone.
Solution 2:
Upgrading your iCloud storage does not add internal storage/RAM to your phone. If you need more storage on the phone itself you need to buy a bigger model.