I don't have a video host. I only have a video file (.mp4, .mov, etc...) Can I still use HapYak?

Absolutely! Simply ensure your video lives on a server that will give you a link to the URL of the file (like Amazon S3, Dropbox, etc...). Copy the link to the file, paste into a new project in HapYak.  Select any open source video player from the "embed type" list, for example videoJS.