I found that there’s a “trick” : you have to not only paste the URL into the right place, you also have to click the selector to say “make this active”.
But when I click the selector after inserting the links, all that happens is that the original stone image disappears I checked whether I need to hit return, didn’t make a difference.
In my case I need to reselect stones after adding them, else it just doesn’t update the image and it uses old image when old image is already gone.
Maybe reselecting new stone appearance right after you uploaded new image will work in your case also. No need to add any additional symbols to the link in this case.
I’ve tried your images myself and they didn’t show on board for me also. I speculate it’s a formatting problem and ogs doesn’t recognize .gif for using to customize stones. I would guess adding symbols to the gif image link somehow “breaks” it to the level ogs can digest it.
I have no idea why or how it works.
Will this feature be further developed? I still can get almost no images to work. I really like the function of custom stones and would love it if it works.