Uploading Binary file via SFTP for Amazon Kindle Fire

Looking for help from anyone that has run into this problem.

I’m building my kwik/corona storybook app on 2010 Mac Pro OS 10.8.5

My apk file is 119 mbs so I Amazon says I have to upload my binary file via SFTP.

I followed their directions but was denied access and was not able to upload the file.

After surfing forums, I found several posts where people had this issue on Macs, but were able to upload on PCs. 

Can anyone enlighten me on the best practice? Is there a better FTP service when using a Mac?

I don’t want to get caught in any Mac ‘red herrings’. 

thanks!

Bill