Hitting a brick wall

As with any project, there is something that does not go as planned. 

 I seem to have hit my brick wall with posting chapters 5 & 6. I have finished chapter 5 and was going to post it on my Tumblr page, but Tumblr does not support the .mp4 file I had to save it as after rendering it in Photoshop. I really like the way I put together the chapter in Photoshop and do not want to recreate the chapter using a different program. So I must find an alternative site to post the last 2 chapters that will also be compatible with the app I created for the project.