We don't support languages that run from right to left. We suggest you to use the images in the presentation instead of text.
1. Build your presentation as such. Write the text in Hebrew in MS-PowerPoint.
2. Take the print screen of the slides one by one and paste these images in the PowerPoint itself. Or if you have images with you, you canjust paste them in the presentation. Save your presentation.
3. Then upload this PowerPoint in the Virtual Classroom.