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Thanks for your reply .
So sorry for inconvenience , for our manufacture capability , if the slots on the outline layer , we will make it , if the slots on the other layer and there are no remark for it, we will not make them .
I'm so sorry for inconvenience ."
Apparently, the part had the slots on a layer not used by the manufacturer, and they would have been cut if I made a remark. Oddly, the drill holes for mounting the PCB's were placed using the "Add a drilled hole" function, and they were present.
So, just be aware that board manufacturers may not always use all the files sent to them.