1. Open Shandong Education Cloud Service Platform and log in the account.
2. Enter the page where you want to add attachments, such as the "lesson preparation resources" page.
3. Find the button or link to add the attachment, and click to enter the attachment upload page.
4. On the attachment upload page, find the "Select File" or "Browse" button, and click to enter the file selection window.
5. In the file selection window, find the attachment file to upload, select it, and then click OK or Open.
6. Wait for the file to upload. After the upload is completed, a prompt message will be displayed on the page.
7. After uploading, you can edit or name the uploaded attachment, and then save the uploaded result.