Yes, attachments have been limited. However, you can still post links to files/images, if you can find a suitable web host where you can upload them.
Some ISPs allocate you some web space to use, so if you have web space that you haven't used yet, now is the time to make it work for you.
Other than that, there are some 'free' web hosts around the net, but many of them disable direct linking to files. You'd need to find one that allows file linking.
Then it's just a matter of typing in the URL of the file you are linking to in the body of your post.
Hope that helps.