Are the file types supported by the Q10?
Supported audio and video file extensions, formats, and codecs - How To - BlackBerry Q10 Smartphone - 10.1
If not, it's up to you to find a program that lets you convert them all to a supported format.
For photos on the media card you must make sure your Q10 is looking at the media card and not at internal storage. By default it looks at internal memory. You need to navigate to the SD Card to see the pics on it.