I'm a bit lost... but if I'm reading you right, I believe MARP extracts the zip archive(which it must be in to upload), and if there are no files with an INP extention, it will reject the file.(posted 9370 days ago)I don't know if that answers your question - please let me know of the exact error message the website gives you if it gives you one. You might also want to try to upload using the alternate form. Just a couple suggestions to start.
Thanks for reading - please let me know how things go :) GB9