To change the Folder and/or Category that a file is assigned to, you will want to navigate to Files–>General Files, and select “Folder/Category” from the Options dropdown of the desired file.

From there, you can use the interface to select the desired Folder and/or Categories for the file, using the tree on the left to select the desired Folder, and the dropdown box on the right to select the desired Categories (It is important to note that a file can be assigned to multiple Categories if desired, but a file can only be assigned to one Folder at a time.)

Once the file is organized in your desired Folder and/or Categories, just click Save to save your changes.