How to delete selection without deleting layer (Affinity Photo 2 on Mac)

[Pretty Opaque]

Using Affinity Photo 2.0.4 on Macbook (11.7.2).

I have made a selection using the Flood Select tool, and see the selection active.  I want to delete that area, so I press the delete key (Macbook), but the result is that it deletes the current layer instead of the selection.  I also tried the menu:  Edit -> Cut, and the result is deleting the current layer rather than the selection.

I have used this same sequence on other files and it works as expected:  the selected pixels in the current layer are deleted.  But other times it does not work.  Is there a step I am missing?

See screenshot (before pressing DEL).

[walt.farrell]

You have an Image layer. You need to Rasterize it so you have a Pixel layer, if you want to work with its pixels.

[Pretty Opaque]

Thank you, that works great!  I think I didn't understand clearly the difference, or why DEL would remove the whole layer.  Now I know to rasterize first, thanks for the quick reply!