Roll20 Image Cache

Hi all, I am developping a character sheet and I noted that roll20 is having some kind of cache for the images that are referred in the CSS/HTML. It sometimes creates me issues, where to test a new icon, I have to create each time a new filename. Also, I see sometimes on the sheet sandbox, the cache is breaking and I have question marks instead of some images. Is there any way to refresh the image cache and force it to reload all the images ?

Not sure if that's possible. This problem have been encountered in the past, but no solution apart from changing the filename was figured out.

Thanks... I think there may also be something with my browser's cache and not roll20... I loaded the page on another browser and all was fine