On a PC running Windows 10, select Start > File Explorer, or select File Explorer from the taskbar.. Press and hold (or right-click) the MP4 file you want to play, select Open with, and then choose your preferred file player from the list of applications.

Customize your theme. To find a theme to use in your presentation, click the Design tab, click a theme, and see how it previews on the slide.. You can further customize the theme by changing the fonts, colors, and background colors on the Design tab.. To change the fonts and colors, click the down arrow in the Variants gallery, and then click Fonts, Colors, or Background Styles.

To get someone's attention in a channel conversation or a chat, @mention them. Just type @ before their name and then select them from the menu that appears.. When an @mention recipient receives a notification, selecting it takes them directly to the point in the conversation where they were mentioned.