Windows 10
Under the Insert tab, click on Object

Select Create from file and then Browse to select a document from your computer.

The document will be put into the slide as an object that you can move around and format.
Windows 11
Under the Insert tab, click on Object

Select Create from file and then Browse to select a document from your computer.

The document will be put into the slide as an object that you can move around and format.
Mac
Under the Insert tab, click on Object

Selecting the object type from the list creates a new document to insert, while From File has you choose a document to insert from your computer.

The document will be put into the slide as an object that you can move around and format.
For additional information, please visit: Microsoft Support to Convert Document to Presentation