Should work now, it was set to only allow 256×256 animations. The only limit now is the 5 MiB size limit. Example animated webp:

Should work now, it was set to only allow 256×256 animations. The only limit now is the 5 MiB size limit. Example animated webp:

There is a pictrs setting to set max width and height for the different thing it supports (images, video and animation). I haven't touched the settings myself. I'll take a look in the morning and probably just disable them if they're set. I don't really see a good reason to limit dimensions, size is the maintenance burden.
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