Attachments Missing

I was trying to follow an old thread yesterday to try and figure out how to do something (Waveform Crossfading in this case) and couldn’t figure out what I was missing trying to understand it. I ended up looking at a cached copy of the thread to see if something changed, and found out that it used to have attachments before the forum change and they’re not there anymore. Are old attachments on this and other threads going to be restored eventually, or are they just gone?