Click the place where the attachment needs to be inserted with the mouse, click Insert-Object in turn, and select the appropriate document under New, such as word, excel and PPT. You can add an empty document as an attachment in this way.

Click Show as Icon, then click Change Icon, enter a name for the new document, and click OK. At this point, you will see the following interface in the object window, and then click OK.

Now you can see the word document icon on the interface. Double-click this icon to open a new document.

Locate the cursor where the attachment needs to be inserted, and click Insert-Object-Create from File-Browse-Find Document-Insert.

This way, you can add existing files. You can click "Link to File" as needed.

Selecting "Show as icon" will have the same effect as step 2. Link to File is selected. When the source file changes, it will be updated to the document synchronously.

After adding, you will see the following interface. The content of this interface is the content of the file in the attachment.