One option would be to break the file up into smaller parts. Gcode is just a text file so you can open it in a text editor and see what is there and manually split the file into multiple smaller chunks.
Does it make sense that the file is 16mb…that seems really really big. It’s also possible that the file has a TON of tiny tiny movements in it and you might be able to shrink the file size. Check out the awesome GCodeClean tool for that here: Command line utility to 'clean' GCode