I tried another file "Eiffel01_2048a+6.bmp" which is 12288x2048 pixels (filesize = 75,497,526 bytes) and it WORKED even though it is larger size than the "png" version of the same file used above (ie "Eiffel01_2048a+6.png ").
At least that's a solution, but would rather use the "png" format.
