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You can limit the size of the uploaded pictures with the constants (in mes_options.php) :

define('_IMG_MAX_SIZE', 0); # size in Kb
define('_IMG_MAX_WIDTH', 0); # width in pixels 
define('_IMG_MAX_HEIGHT', 0); # height in pixels

For documents it's :

define('_DOC_MAX_SIZE', 0); # size in Kb

If the limitations are not respected, the upload is aborted and an error message is displayed