Our best practice is to create a GIF, from your presentation slides, as a FOMO (fear of missing out) MMS and send with TWILIO, around 10 minutes after the event has started.
The website we chose for this example is EZGIF.com
Click on GIF maker on the main menu
Choose 3-5 slides from your presentation
Click on Upload
In the next stage you can choose various settings of your preference
Click on 'Make a GIF'
Choose 'Optimize the GIF' to shrink the file size, which should be around 200 kb max, to make sure the file is accepted with your service provider
Choose the highest compression for smallest file size
Click on 'Save' and the file will download