# How to Present a Presentation and Prepare it in Advance
The TrueConf Group terminal allows you to broadcast content during calls and conferences.
# Preparing Presentations
To select a content source for presentation in advance, go to the Presentation section on the main screen.
The device selection menu is activated by clicking the Choose device button. Here, you can add network sources such as RTSP, VNC, NDI, and below, you will see external devices connected via an HDMI cable to the capture card.
To connect external devices via HDMI, the appropriate configuration of the TrueConf Group is required.
You can also display content from a file. To do this, connect an external USB drive and click the Choose a file button. TrueConf Group supports presentations from USB drives with images in PNG, JPG, TIFF formats, PDF documents, and videos in MKV, MP4, TS formats.
The presentation audio is always output to the meeting room speakers. During the conference, the presentation audio is mixed with the microphone signal. Muting the microphone does not disable the presentation audio.
When an HDMI source is connected, the content will automatically be displayed on the screen. Depending on the settings, it can also be automatically shared in the conference.
# Presentation display
To share content during a video call or conference:
- Press the PC
button on the remote control or the tablet screen – .
If an external device is connected to TrueConf Group via HDMI, pressing PC will open a list of connected devices for quick content sharing.
2. When selecting to display a file from a USB drive, a window will open showing its contents. Use the navigation buttons to select the desired file.
3. If the administrator has selected button-triggered content sharing in the call settings, a new video window with a preview of the selected content will appear on the terminal screen, and you should proceed to step 4. Otherwise, the content will be immediately shared in the conference.
4. To start the broadcast, press the PC button on the remote control, then select Choose device. All connected participants will see the presented content in a separate video window. On the terminal layout, the content will be displayed by default in a full-screen enlarged video window, and this will not change when new participants join the conference. The video layout can be changed with the 
button on the remote control.
5. During the presentation, use the following control panel buttons:
navigation buttons – for navigating between file pages or moving around a zoomed image;
zoom buttons – to control the size of the displayed content image.
6. To stop sharing content, press the PC button on the remote control and select Presentation stop.