Hi Avabrooks,
Thanks for the info... I usually don't rely on 'plugins' as they do often cause more problems than good.
Luckily, I'm fully able to design and code for WP - I've recently updated a bespoke core theme I built using Bootstrap 4 to now include GSAP + Barba.
The gallery that prompted this post was an issue specifically at a client's request and I've now built it.
Personally, I hate the result and I'm hoping for him to realize how horrible it is and use the alternatives I've shown him using GSAP.