To add images by picking files:

1. On the Scanner page, make sure the left panel is set to File Upload, then click the Files button.
2. Your file browser opens. Select one or more images, holding Ctrl on Windows or Cmd on Mac to pick several at once.
3. Click Open. The files land in the queue underneath, each with its own progress bar, and you can remove any of them before you hit Identify.

The Folder button beside it takes a whole folder including its subfolders in one go, and Phone lets you send images across from your phone camera. You can also drag images straight onto the panel instead of using any button. Files, Folder and Phone sit directly under the Identify button and stay visible whether or not the Scanner settings above them are expanded.