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I think the drop-box option is currently only available for use with the collaboration tool and is not yet available for other models.
sometimes there is a problem with the server GRABCAD - rare!
Please try again later
By adding the "Revisions" (screenshot) - page should tell you about the effects of
Successful / unsuccessful.
I click on revision and appeared this button
https://farm9.staticflickr.com/8016/7495832182_48d815c322_b.jpgthen i click on this button and appeared this
https://farm8.staticflickr.com/7131/7495832052_b1b0e5ec3e_b.jpg