Cant slice my STL

[DavoD 0]

I just installed Ultimaker Cura on a new laptop, selected my printer, Ender 5 Pro, and added my chosen STL.  Before I could go any further this popped up on the screen "Make sure the g-code is suitable for your printer configuration before sending the file to it. The g-code representation may not be accurate.".  I checked to make sure it was not a previously sliced item... Instead of getting the option to slice the item, I only get the option to save it to a destination.  Can anybody point me in the right direction?

[GregValiant 1,354]

It sounds like you opened a gcode file instead of a model file.  If the Layer Slider works without having sliced it then it's a gcode file.  You can also open that "bad" file in Notepad and see if it is just a mis-named Gcode file.

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Try another STL and see if it will slice.