Sliding animations and motion across WA's editor UI cause me extreme nausea and motion sickness. There is meant to be a toggle for this. At some point, it stopped working and hasn't been fixed for months. I can't currently access WorldAnvil's edit UI without experiencing nausea and dizziness every time I try to navigate around.
While it can be bypassed for articles by using the old editor and the API, there's no otherwise accessible option for getting to the image manager that I'm aware of. Ideally, all pieces of UI should be accessible without animations, especially animations that swipe across the entire screen or cause lag.
As a bonus info tidbit, this is covered under SC 2.3.3. of WCAG which can be read
here. I think my particular reaction to this is likely also because the animations aren't smooth on my PC (they stutter/lag) - I experience similar in VR when the VR environment stutters due to low framerates, and this is a very common reproducible reaction across users.