Warn when can't identify mimeType of files in Desktop, Obsidian clients

src/interface/desktop/main.js

@@ -106,6 +106,7 @@ function filenameToMimeType (filename) {
         case 'org':
             return 'text/org';
         default:
+            console.warn(`Unknown file type: ${extension}. Defaulting to text/plain.`);
             return 'text/plain';
     }
 }