You shouldn't have any problems uploading 85meg by ftp

Keeping it well basic, if you're on windows, put your file right on the base level of your c drive then click 'start' then 'run'

type 'ftp'

type 'open www.yourwebsite.com'

you'll be prompted for your username, then your password

you'll be placed into your default directory, you need to navigate to the directory you want the file to be placed in, it's quite simple - to move up a level type 'cd ..' to move into a subdirectory type 'cd subdirectoryname'

when you are in the directory you want to upload to type 'put thefilename.xyz' this will start the upload.