To do Alt + N P O S on Mac in Excel, download and install Accelerator Keys, then press Option, followed by N, P, O, and S.
Command: Stock Images (Place over Cells)
This is how to do Alt + N P O S on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + N P O S opens the Microsoft Stock Images library to browse and insert royalty-free images as floating pictures over cells. These images can be freely positioned and sized on your worksheet.