I can't move an item into a folder that is shared with me?

Problem

I can't move an item into a folder that is shared with me?

Solution

Correct. This the way the system has been designed. You cant 'move' a file into a shared within a folder, you can only 'upload' that file.

If users wants to 'move a file', they will need to download the file and upload it again.

(i.e. you can only move into folders you 'own').