The uploaded attachments are automatically deleted from the temporary
wp-content/plugins/si-contact-form/attachments folder as soon as the email is sent. This is done for ease of management and security. The files could contain sensitive information and could be accessed publicly.
I think you can retrieve the attachments from the database.
This is where you get support for that plugin
http://wordpress.org/tags/contact-form-7-to-database-extension
http://cfdbplugin.com/
Do not expect much success with any files over about 2M
Sadly, with HTTP POST, it is normal for there to be no graceful error when the upload fails, expect a white screen timeout when this happens.
Form POST reliability with large files is very limited because of the user’s upload speed is usually the slowest link. Time is one of the factors that causes the failure of large file uploading. Just because your server has large ‘upload_max_filesize’ and ‘post_max_size’ settings does not really mean you can expect success with large files.
The biggest obstacle to HTTP POST uploads is the fact that most broadband internet upload bandwidth is usually 10 times lower than the download bandwidth. This will easily cause server timeouts when trying to upload files bigger than 1-2M by HTTP POST. For this very reason, if you need to upload files bigger than 1-2M, you really need to use a FTP server or a large file hosting service.
If you’re having problems uploading large files but small files go through fine, here are some things to try:
– On the contact form edit settings page, make sure you’ve set “Attached files maximum size allowed” to an acceptable value. Settings 1mb or less will usually have best results. examples: 500kb, 800kb, 1mb, 1.5mb, 2mb. This is why the default setting is 1mb. Click ‘help’ next to this setting to see what your server reports it is capable of: “Your server will not allow uploading files larger than than: X”. The value for X can vary based on your PHP settings for upload_max_filesize and post_max_size.
– In php.ini, be sure you’ve set the the upload_max_filesize and post_max_size to be large enough to handle your upload.
– In your httpd.conf (if you’re using apache), check that the LimitRequestBody directive isn’t set too low (it’s optional, so it may not be there at all).
The ultimate solution for large files is to have your users send you large files with a large file hosting service.
