Hit OK to confirm it and go back to the home interface.
Then click on the timeline and hit the Split icon to divide it into two clips. Click the Cut menu on the top ribbon to open the Clip window. That can speed up the process of transferring and sharing. If the MP3 file is very long, you'd better to split it into several clips. Then launch it and click the Add Files button to import the MP3 files you want to shrink. Download and install the best MP3 compressor on your PC.