Content doesnot show during prototyping

Hey Alishba, welcome to the community!
To cover some grounds, can you check if you have also set up the device if your choice in the prototype setting, select the Prototype tab in the right sidebar.

By selecting the Device, you can customise the device type, orientation, and model used in presentation view.
For more information about the options you can get from Device, you can check this article for further information:

Let me know if this helps, if not feel free to share the URL of the file so we can try to replicate here, or share it directly to our support team by filling this form: here