What kind of formats are postable on Bitcointalk?
I know you can post images and gifs, what about mp4 animation?
And can copper member post gis and mp4s?
As far as i know the copper membership is simply a shortcut to the access you would otherwise receive at "member", in terms of posting images etcetera.
I don't remember you were able to post anything with mp4s as member, only gifs.
since they use the same [], i think it should be just the same as the posting of any other normal picture/image.