Reply To: Need to transfer directory on old version to new site

@ Ryan

There no need to use the disable real mime check plugin. Connections already properly deals with what that plugins is attempting to fix by disabling a security feature. The mime plugin I asked you to install is under consideration to be merge into WP core since it provide more robust file validation.

As for the file being renamed to .htm, that definitely sounds like another plugin or theme interfering with the file uploads. Deactivate all plugins except Connections, the mime plugin and then activate the default the WP theme and then try again.