Last attempt: Buttons keeping project from loading

Let's try this one last time. Two projects. One created from the CP healthcare template with buttons, images, text to speech etc. One created from a blank project. Both play fine locally on my PC. Both of these are housed in a publicly available Instructure Canvas site. The one from the Healthcare template plays with the buttons and audio if I am logged into Canvas AND when I am accessing it publicly. The one I created from a blank project only plays locally on my PC or when I am logged it Canvas. When I remove my manually inserted back and next button from the project I created from a blank project, it then works either way.. Why would one project with the same features play fine and another not play and why would the buttons keep it from playing? After many years of using Captive I would rather not revert back to PowerPoint or switch to Storyline. Please advise!!