Can I set my own background image rather than use the random images setting?
Look under Config->User Interface->BG Image URL
If I wanted to use my own image then would I need to host it on the web?
Correct.
Why does the url not save? I have applied images to many of my wled instances, and none of them stick through a power off/on.
Interesting. I have images I host myself and none of them stick. I do see now that it only applies to the particular browser, but I didn’t change browsers. Maybe some cache got cleared? Does anyone know how to add a permanent background image via css?
I am not sure of your version info if that is not 0.14.1-b3 then list it and the MCU you are using and I could try to replicate but i did this on multiple units and they all worked but might be something we could isolate . If all fails then might be take a backup and reset the unit
the information is stored in browser’s local storage
if you erase it upon browser exit, it is lost
I guess dynamic background is out of the question , we can still gif it