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Extrusion on a preexisting file

I imported a file from Thingiverse of the Iphone 14 and wanted to make the holes on the sides for the buttons a bit larger. I tried to extrude cut a larger hole but it wont let me even though there are no faulty parts in the import. Ive done this before in the same manner of importing a file and extrude cutting parts of it but for some reason this one will not let up..
https://cad.onshape.com/documents/a9fb03fad91ced5b27c1757c/w/c64a5dd3d59986b554ebf583/e/d5d422555ab0875ef545688f
Comments
The reason is that the import as-is came in as surfaces. I added a couple of Boolean features directly after the import in order to create a solid. The Extrude 5 (remove) feature then works just fine.
https://cad.onshape.com/documents/735f6213318e2bececb6fe62/w/dfceafb151639da03e6e044d/e/b4b363764628b860726f19fb
Wow! I knew it had something to do with the surfaces but i wasn't even really sure what that meant or how to go about fixing it. Thank you so much!!