I Can Not for the life of me figure out how to

Get our own pics (png / jpeg) files into new MODES, let alone existing modes with our images replacing the image files inside the modes. I’ve literally copied existing (working image) modes and re placed the images renamed and uploaded - I’ve copied replace the images with the same names to see if that would work - I 've tried a bunch of things but our EYESY is not recognizing the mode, I’ve reloaded and such and nothing works. What am I doing wrong in the editor or file or code to make it work. I am in AP mode with the online editor and need help…