Can someone tell me if it's possible to upload videos from your wii by flash

No you won't be able to use a flash drive but you can use an SD Card. Put your SD card in your Wii, put the replays onto the SD card, buy an SD card reader for your computer (about 5-15 dollars if your computer doesn't already take SD cards) and put the replays on the computer. You may have to convert them too though.
 
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