Instead, when i (somehow) sense that the image was replaced in the folder with a new image, then i want to load the new image into the sprite.
And, as mentioned, the simplest case i am looking at right now is that there always only exists one image in the folder which is displayed on screen.
app running locally on an android tablet
Nw.js only works for Pc
It reads from a local folder (which happens to be a dropbox folder)
For that, you gonna need a third-party plugin I believe not sure if there is any for C3, I think there used to be one for c2 but not really sure.
The best solution is to work with local storage so you can save the Image and have control over when they replace it, this option will much easier to do.
Though if you need to update the image for them then it may be better to have it in a server and use Ajax to load the Picture.
Let's see if someone else has a better idea of how to work with DropBox so it can help you, I personally never used it.