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Zbrush 3.5 docs issue

Hello Zbrush community i just got Zbrush 3.5 R3 and im having an issue with it.
whenever i save a document and later reopen Zbrush and load the doc i was working on i cant edit it in anyway. Maybe im just a noob but i couldnt find any answers on the forums to this issue so plz help thnx!

quoting:

In the Tool palette:
“Save As” is used to save your 3D model as a ZBrush file. (.ztl)
“Export” is used to export your 3D model for use in other software.
“Load” is used to load a 3D ZBrush model (.ztl) file.
“Import” is used to import a 3D model that is in another formate, like (.obj)

In the Document palette:
“Save As” will save 2.5D work that is on the canvas but not 3D models. .
“Export” will export an image of what ever is in your canvas, both 3D and 2.5D work.

see:
http://www.pixologic.com/zclassroom/homeroom/tutorial.php?lesson=beginner

You will find all the answers you need in the last video.