Log server errors

wp-mat.php

@@ -3,7 +3,7 @@
  * Plugin Name: wp-mat
  * Plugin URI: https://git.autistici.org/noblogs/wp-mat
  * Description: Process uploaded files through MAT
- * Version: 0.0.4
+ * Version: 0.0.5
  * Author: Autistici/Inventati
  * Author URI: https://www.autistici.org/
  * License: MIT
@@ -81,6 +81,7 @@ function wp_mat_handle_upload_prefilter($file) {
             "size" => filesize($new_tmp_file),
         );
     } else {
+        error_log("wp-mat: server error for file=".json_encode($file));
         @unlink($new_tmp_file);
     }