Hi Rick,
The issue is with any good provider, it's normal, you can't direcly import a 70mb file at once (unless you have a dedicated server but even, server should be setup to prevent huge file sizes from WP import).
<< nginx and apache expert
So, if you want to do that kind of big import, you could use ftp or ssh, and upload them to a new directory you create like:
wp-content/personalfiles/
And upload all that there, you will need to call them by direct link after.
As a side note, changing php.ini or nginx config files is not good security wise, because it could open for then 200 mb uploads if a guy finds a hole, or trying it, for your user name on server - if server is very weak the whole upload can wrecks server.
Hope it helps,
