The flash file cannot be shown in SharePoint 2010.
SharePoint Central Administrator limits the accessing to some browser files due to security reasons. Please try the following 3 steps to resolve the issue:
- Go to Central Administration -> Application Management ->Manage Web Applications.
- Select General Settings for a specified web application
- Find Browser file handling, select Permissive. Normally the default value should be Strict.
Applies for: SharePoint 2013