Forum attachments are limited to certain file types, e.g. images files (.jpg, .png), text files, etc. It's easily fooled though; you can just rename your RAR file with a .txt extension, and it will upload, but there are plenty of 3rd party sites for sharing files (MediaFile, DropBox, Google Drive).
Also, savestates can be problematic since the person receiving it must have the same Dolphin revision that you created the savestate with in order to use it. They aren't compatible between Dolphin revisions. A more compatible method is to use the Wii save data from your Dolphin's Wii folder.
Also, savestates can be problematic since the person receiving it must have the same Dolphin revision that you created the savestate with in order to use it. They aren't compatible between Dolphin revisions. A more compatible method is to use the Wii save data from your Dolphin's Wii folder.