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Honestly i don't know, but you've got the option to embed a youtube preview. Maybe that helps.
but not during creating a new project gallery
mmm maybe i can embed youtube preview in a comment after creating gallery, i try, tnx man
Oh you meant in the gallery, sorry man, i thought you wanted to do this for a saleable 3D project. From my knowledge you can't upload videos in the gallery, maybe just paste a link in the description field as you said.