@natsuiz I bought TS3 on Steam, and much later transferred the base game and all my packs to Origin, so that way it will work. Hopefully someone else will answer you with more information.
Its a start but I was hoping to see if it is able to use Origin Expansions if I buy the Steam Version as I have late night and would be nice not to have to buy it again. Thanks for the reply!
@natsuiz You can only play packs in Steam that you've bought in Steam; your content from Origin (or disc) won't be recognized. It does work the other way though: you could register a Steam (or disc) purchase in Origin and then download it from your Origin game library just as you would if you'd bought it directly from Origin.
