Why doesn't my Anim Modifier run on imported animations?

Modifiers are per-asset; you must add them to each Animation Sequence's Modifiers list, or apply via the Skeleton's Animation Modifier Bulk Apply tool.

Skeleton asset → right-click → Apply Animation Modifier → pick modifier → choose anims. Runs on every selected sequence.

Auto-apply on reimport?

After adding to a sequence, modifier reruns on reimport. Add as part of asset import pipeline (Python script) for automation.

Fix: Unreal Anim Modifier Doesn't Run On Import

Quick answer: Add Modifier to each AnimSequence’s Modifiers list. Use Skeleton’s Bulk Apply Animation Modifier for many.

You write a Modifier that adds Foot Lock notifies. Reimport sequences; nothing happens. Modifiers don’t auto-attach.

The Fix

For each AnimSequence:
  Asset Details → Animation Modifiers
  + Add → FootLockNotifyModifier

Bulk:
  Skeleton asset → right-click → Apply Animation Modifier
    Select modifier
    Select sequences (Ctrl-A for all)
    Apply

Modifier registration is per-sequence. Bulk apply automates large skeletons.

Verifying

Reimport: modifier runs, notifies appear. Without registration: no change on import.

“Register per asset. Bulk apply for many.”

Related Issues

For Anim BP cached pose, see cached pose. For Control Rig flicker, see Control Rig.

Per-sequence. Or bulk.