Greetings, gamerviz! Sure, I just added the file to this asset pack. Just have in mind that I did this animation (a long time ago) by improvising in order to have a reasonably interesting animated cover. It was not mean to be sold. But now is here! The files are called: cover_thumbnail_liquid_vfx.aseprite and cover_thumbnail_liquid_vfx.gif.
Thank you so much for you interest and support!