https://us.community.samsung.com/t5/Galaxy-S23/Making-Gallery-stickers-more-like-actual-stickers/m-p/2683207
Solved: Re: Re: Stickers - Samsung Community - 2683149
Oct 6, 2023 - MMS will convert the sticker into a compressed image file so that it can send it. - 2683149
samsung communitysolvedstickers