I want to upload a video from my computer to post it in a tweet. Is there a way I can do this through tweetdeck as I don't have access to the actual twitter account, I was just invited to tweet through tweetdeck.
I am not quite sure if it will work. Try to use "Add Image". It seems like that video file formats are also available. If not, try to use the Tweetdeck app and see if you can record from the phone. Otherwise you will need another platform and a link to the video.