Create a folder called "ExGraphics" in your ROM folder or use
to have Lunar Magic create it for you. Drag your .bin graphics files into the ExGraphics folder, and when you reinsert they should be seen in
You may be trying to insert raw map16 files, which can be inserted but aren't visible by default. When looking for your map16 files, there will be a box in the browse window where you can change your file type to look for. Under that menu should be raw map16, and when you click it your raw map16 files will appear.
To insert a palette, go into the File menu, then into the Palettes menu, and click on "Import Level Palette from File...". Choose the .pal file that you want for your level palette.