How to upload dead gold content

I've been here for a while, but I've never uploaded content before

I've just come across two gold threads with dead content, and I realised I actually have the content on an oooold drive. What's the etiquette in that case? Can I upload it to Mega and post the link in the thread? Or, since they're gold threads, do I need to start a new thread?

Sorry for the newbie questions! I've searched the forum but couldn't find an answer, although I may just be being an idiot and missing something obvious