I saw some other people having problems with the attachment and I had problems as well. I followed the video but using the “hand_r” socket I could only twist the wrist of the character. Using the grip point that was already set up beforehand I was able to manipulate it the way I wanted.
I also remembered from some other course to use the preview window as I have in the screenshot, it feels a bit faster to do it this way. Just posting this here if someone is having similar difficulties!
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Thank you for sharing this! This will help a lot of people out 
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