I figured it out (or at least this seemed to work).
after reading questions others asked about opening spreadsheets from mail, I realized that this spreadsheet is saved in dropbox, so I opened it on the ipad using dropbox and did "Open in Numbers" and it seems to have worked.
My only problem now is that I don't think that if I make changes it will also change the original one in dropbox. My lap top is not an iOS device so I don't think there's a way to update the files on there unless I can maybe somehow get it into itunes???
anyone understand what I'm trying to do?
I'm basically trying to be able to work on a spreadsheet from my iPad, iPhone (using Numbers) or laptop (using excel) and have all of them update the same spreadsheet. Is this possible?
I keep answering my own question LOL
anyway, it looks like there's no way to have a "real time update" between an iOS device and a non-iOS device but I can transfer the files back and forth. I'm guessing this is the best I'll be able to do.
my question remains tho, so if anyone knows a way to do it, feel free to comment