Let’s put it plainly: Symbiostock is no longer usable unless the developers update it to at least PHP 8.0.
Already now the proper function is questionable, because my hoster (and probably very many others too) don’t support PHP 7.0-7.4 anymore, but my website with the store is already running on PHP 8.2.
And I can’t upload new photos to the store at the moment because of that.