Images will probably be the most commonly used type of multimedia on your wiki. By default, MediaWiki only allows for certain image files to be uploaded to a site. These files are: JPEG or JPG (Joint Photographic Experts Group), PNG (Portable Network Graphics), and GIF (Graphics Interchange Format). Other common file formats, such as TIFF (Tagged Image File Format) and BMP (Bitmap), require modifications to the configuration file which we will cover later.
MediaWiki also limits the size of the file you can upload to 8 MB. This too can be changed, however you have to keep in mind that if you are using a web hosting provider, your storage space is limited. Allowing larger files will use up that space more quickly. Also, larger files require greater bandwidth usage when they are displayed. With hosting providers, if you exceed your maximum bandwidth for a period of time your site may not be displayed until the account is reset (usually every month), or you may be charged extra...