iWork for iOS Numbers question

[addiecool]

Hi. I was generally trying out iCloud Drive thinking of moving from Dropbox. I normally like to store all documents relating to a project in a single folder. It could be a spreadsheet, a presentation and so on. But with iCloud Drive I found that though I can create a folder outside the default numbers folder and store a spreadsheet there, I cannot access that on an iOS device. When I try to open a file using the "+" icon in numbers the app creates a copy of the file inside the default numbers folder.

Is there a workaround? I don't know why Apple cannot fix these issues or limitations. Thanks in advance.