how do you mean shows only screen shots? Does it show the folders and the images? Please attach a screenshot if possible.
If you are having trouble loading a photo to edit in a PS Touch document, read the Quick Start Guide.
You can create a new photo layer (and select photos from your gallery), as you can see below.
Or, you can add in a image from the Google image search, as shown below.
Please let me know if you have any questions,