I had a similar problem using Fully Kiosk to load dashboard background images; turned out it was a problem with the hosting of the image (in a private folder on my NAS). Backgrounds would load fine on a browser authenticated and logged in to the NAS, but not on Fully. Moving them to a public folder only available on my local network solved the problem across all browsers (Fully, Silk, etc.).
Likewise, with POE camera streams I've been perusing the forums for a while and have yet to find an approach that works without some third party application getting involved since authenticated RTSP streaming isn't supported. From what I have seen a lot of users will use Blue Iris and embed a link to a MPEG stream in a dashboard tile. If you have a NAS you can do the same. I run Amcrest POE cameras, essentially Dahua, and have livestreams converted to MPEGs through my NAS. I know there seems to be a lot of displeasure with how HE dashboards feel and perform, but with some tweaking and reading the forums you can usually get them to do what you need, and do it locally. Mine turned out fine: Show Off Your Dashboards!
