How to Resolve the HTTP Image Upload Error:

1. Increase Upload Limits:

• Modify your php.ini file to increase the values for
  upload_max_filesize and post_max_size.
• Alternatively, add the following lines to your .htaccess file:
  php_value upload_max_filesize 64M
  php_value post_max_size 64M
  php_value memory_limit 256M
  php_value max_execution_time 300
  php_value max_input_time 300

2. Verify File Permissions:

• Check that the wp-content/uploads folder has the correct file permissions. Set directories to 755 and files to 644.

3. Adjust the Image Format or Resize:

• If the image format is unsupported or the file is too large, switch to a compatible format (like JPG or PNG), or resize the image before uploading.

4. Disable Plugins and Switch Themes:

• Temporarily deactivate all plugins and switch to a default theme (e.g., Twenty Twenty-One) to identify if a plugin or theme is causing the issue. Reactivate each plugin one by one to find the conflict.

5. Regenerate Thumbnails:

• Use the Regenerate Thumbnails plugin to fix any problems related to image resizing that might be causing the error.

6. Clear Your Browser Cache:

• Cached data in your browser can sometimes interfere with uploads. Clear your browser’s cache or try uploading in a different browser.

7. Increase PHP Limits (via .htaccess, wp-config.php, or php.ini):

• If you can’t access the php.ini file, add the following to your wp-config.php file:

  define(‘WP_MEMORY_LIMIT’, ‘256M’);

8. Check for HTTP Errors:

• Examine your server’s error logs for any HTTP-related issues. If necessary, contact your hosting provider for support.