Hi, Brian
How are you trying to bring in the symbols? Can you just open one file directly?
Goto content librarian (right click on tool bar are to toggle on if not open) open the explorer button looks like small window box with dots in.
Once open you can add a new slb symbol library, see pic I attached. Then select your new library then hit the import button an browse to the files you want to add. Change the file drop down to dwg , or whatever you file is. You can select multiple files at once to import. Be careful of units... You can turn on the ask for units when file loads by going to file open chage drop down to dwg and click options button and check the dialog box that says ask when opening.
Regards
Jason
Regards
Jason