From the post creation flow, you can add a video to your post. To add a video to your post, click the Video icon just below the post Description.
The maximum video size is 500 mb.
You'll be prompted to select a filed stored on your device. After selecting the file, a preview of the video will be available in the post creation flow. You can click the X in the top-right of the video to remove it from the post. Then enter the post's Title. Additionally, you may be required to enter a post Category and Tag before clicking Submit.