File attachments may fail to upload for several reasons. The most common cause is limited server-side configurations, especially with large files.
Make sure PHP is properly configured to handle medium to large file uploads. Locate the appropriate php.ini file and adjust post_max_size and upload_max_filesize based on your needs.
When using Nginx, make sure client_max_body_size has a value that allows you to send medium to large POST requests.
Remember to restart Apache or Nginx after adjusting the values.
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