You can upload your PowerPoint presentation and use it directly with OptiSigns.
If you want to use PowerPoint Live (for web) and have the slides automatically updated as you changing your slides on MS Office 365, please follow this guide.
Here's steps by steps how to.
Log on to your account at https://app.optisigns.com/
Click Files/Assets tab.
Then click Upload Files
Drag in or select your PowerPoint file.
Your PowerPoint presentation will be uploaded and ready for use. You can see the first slide in the thumbnail.
Now you can go back to your Screens tab and assign the PowerPoint presentation to your screen.
Select the PowerPoint presentation
Enter Duration of the presentation. If you have 10 slides, and Duration is 60 seconds, each slide will be advanced after 6 seconds.
And you are done!
Now your screen will be playing the PowerPoint Presentation.