How to share a .tiff file with visitors?

I will cut right to the chase. The main reason I paid for my Wix website is to allow visitors to

download a .tiff file from the site.

The .tiff file is a high quality 4M image.

Can someone please give me step-by-step instructions how to do this?

Only on-site downloads (not involving another company such as Microsoft or Google or Facebook etc.)

Thanks!