SimpleQuestion

For a website I work on, I did some custom css to put a larger play button on videos, which required a custom graphic to accommodate the upscale of the image used. To do this, I uploaded an image to the site's library and temporarily placed it on a page to grab its URL, then removed it from the page and used the URL to implement the change I was trying to make. And it worked. Until yesterday, when the play button disappeared. I looked through the site's image library and couldn't find the image. I don't remember deleting the image at any point. Is this something that SquareSpace does automatically if images aren't in use?