technical questions on attachments

[carrychris2009]

I don't know if this is The Place to do it but i have a request for the moderators.
Since mediafire has changed its format and I now use Dropbox for file sharing ,
I was wondering if I could Pleas go back and edit in Dropbox in place of mediafire files (that now make people download videos to see them ) . The new format for a thread only allows me to go back two posts or two days to edit a post on my thread. I don't want to create a new thread or make major Changes I just want to substitute dropbox for the Mediafire links I posted so I would need the capability to go back and edit these old posts and have them accessible to me so i could do that. Then there is my request.

thanks
CarryChris