So I brought in 2 files into the PDM and when I highlight them to see a preview, this message pops up. I followed the directions, but the check box was already checked for tesselation data.
The checkbox is available only on a part, not an assembly. To find which part in the assembly needs to be saved, open the parts with the "Quick View" checked (Quick view is in the lower left of the open dialog box.) This opens the part in edrawings and will give you the tessellation message. After insuring that all of the parts are saved correctly you will then need to open the assembly and save that.
Try unchecking the "Save tessellation" box, save and close the part. Open again, check the box, save again. Also make sure before saving the second time that "Deviation" (also under Document Properties -> Image Quality) is reasonably small for your part size, e.g. 1/1000 of the part length.
The tessellation box is "greyed out".
Retrieving data ...