2. Method: First download the purchased online course to your mobile phone, then press and hold the file pop-up menu and click the "Rename file" option. In the pop-up dialog box, change the file suffix to "zip" format option, and click "Save".
3. yes. First, open the app client, double-click the file to be exported, click the export button on the right, and select the export format. You can see the PDF format below. Click to select PDF format for export, which will neither change the format nor affect the typesetting.