Update app/Config/Mimes.php

Co-authored-by: Michal Sniatala <michal@sniatala.pl>

Author: FrancescoCiannavei

app/Config/Mimes.php

@@ -478,6 +478,7 @@ class Mimes
             'application/sla',
             'application/vnd.ms-pki.stl',
             'application/x-navistyle',
+            'model/stl',
             'application/octet-stream',
         ],
     ];