Hello dentister,
This is Kevin from palmOne. When you look at your card via FileZ, are there folders for AUDIO and DCIM? In order to be recognized by your handheld, most files need to be in a specific location on the expansion card. If the files are in the wrong location, your handheld may not be able to find them, and they won't appear on the handheld. Try the palmOne Knowledge Library article
"Using a USB SD/MMC card reader to transfer files to an expansion card' and this will be explained further. You may just need to create the folders on the card and move the appropriate files into them.
Hope that helps.
Sincerely
Kevin