I'm relatively inexperienced with Jed. I have downloaded a level which contains several new 3dos, mats, and other stuff. Upon opening this gob, none of the new 3dos are visible (they're just cubes.) I put 'em into the same folder as the gob, but no difference. Cautiously, I made one or two templates in an effort to make these certain 3dos appear. They did not, and now that template name is gone; "reload templates" has no effect on restoration...Please, how can I work with these 3dos (move them around and see them?)

It's not going to find them in the gob file. you need to extract them and put them into the proper subdirectories of your project directory.

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