Try the following actions:

• Verify that your BlackBerry® smartphone or BlackBerry® PlayBook™ tablet has enough available storage for your media.
• Verify that your songs don't contain digital rights management (DRM) technologies.
• Verify that your media files are in a supported format.
• If your videos didn't synchronize or import and the video extension is supported, verify that your video or audio codecs are supported.
• Verify that mass storage mode for your smartphone or file sharing for your tablet is turned on.