I’ve had problems uploading flash, but that’s because of the size of the files. I’m working on this with one other person on an internal Apache server.
What we’ve done is updated the .htaccess file and php.ini, but for some strange reason there’s still a setting somewhere blocking us from getting above 10MB. I’ve read the PHP default is 2MB.
Look and see what your upload limit is.
To increase the upload limit wee https://roshanbh.com.np/2008/01/uploading-larger-files-in-php.html for .htaccess
and
https://folkspants.com/wordpress-upload-blues-phpini-upload_max_filesize-is-2m for php.ini
I can’t remember if you can upload SWF in WordPress 2.9.2 by default.
If you can’t upload the file because the error message saying the file type is not supported than install the PJW Mime Config plugin.
https://www.ads-software.com/extend/plugins/pjw-mime-config/