2. When selecting a picture, the "Picture Tool Format" menu will appear on the top menu bar.
3. Click the "Compress Picture" button under the "Format" menu.
4. A dialog box for compressing pictures appears with many resolution options. We choose "Web( 150ppi)".
5. Note that there is another item "Only applicable to this drawing". If you put a √ in front, only this picture will be compressed. If you want to compress all the pictures, you should remove the leading √.
6. Finally, click OK.