To do Alt + N P I B on Mac in Excel, download and install Accelerator Keys, then press Option, followed by N, P, I, and B.
Command: Photo Browser (Place in Cell)
This is how to do Alt + N P I B 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 I B opens the Mac Photo Browser to select an image to place in a cell. This gives you quick access to your Photos library, allowing you to browse and insert images that will be embedded within the selected cell.