added files to module: use drush to upgrade to a new version of this module will added files be deleted? A co-worker has added a couple of .css files to the quicktabs 3rd party module.  What will happen if you use drush to upgrade to a new version of this module.
Will these added files be deleted or kept as-is?
If the css files are stored in the quicktabs module directory, yes they will be lost upon upgrade.