This is the list of image types that the script will accept when using ImageMagick. If you're not sure about the information required, ask your webhost. You can enable or disable bridging at any time, but you should make up your mind on bridging when installing Coppermine in the first place, because there are some issues that have to be taken into account: if you already have users inside your coppermine database when enabling bridging, the correlation between those initial coppermine users and the "new" users from the app you bridge with gets lost. The positions are set using the 'sort my pictures' page. MySQL is the type of database service that is available on most webservers.
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