From the Super Mario Wiki

Hello, Imagecategory-reminder. Good job on your recent uploads. But when uploading files, keep in mind that you must correctly categorize the file. It is simple to learn how to correctly do so. Just search for the correct category by starting with the following groups:

Images Audio/Video Files

When uploading, copy the full title of the category with square brackets, and insert it into the summary text box (below the {{aboutfile}} template), replacing the {{uncategorized}} template entirely. For example, files related to the game Super Mario World would use:

[[Category:Super Mario World Images]]
[[Category:Super Mario World Media Files]]

Please consider the above information before uploading more files. Keep in mind some files can belong to multiple categories. Don't put images into media categories and vise-versa. If you continue uploading files without categorizing them correctly, then a warning will be issued. Thank you for reading, and keep contributing.

{{Imagecategory-reminder}} can be issued to users who are repeatedly uploading files without categorizing them as specific to the media it came from. When issued, please remember to sign below the template with ~~~~ or {{User|Your username}}.