Attack montage does not play on custom C++ protagonist although movement, jump and input work

[swyccaaa]

Hi.

I have a custom protagonist built on my own C++ character class.

Current setup:

• movement works perfectly
• mouse look works
• jump works
• Enhanced Input works
• IA_Attack exists and is mapped to Left Mouse Button
• Attack Action is assigned in BP_GasparPlayer
• Attack Montage is assigned in BP_GasparPlayer

Problem:
Attack montage does not visibly play in game.

Already tested:

• multiple attack animations
• multiple montages
• montage slot changed
• UpperBody slot exists in AnimBlueprint
• montage assigned correctly in blueprint

AnimBlueprint:

• uses Slot UpperBody
• locomotion works correctly
• slot branch exists

Question:
How do I debug whether the problem is:

1. input callback not firing
2. Montage_Play not called
3. montage blocked by AnimBlueprint blend logic
4. slot not reaching final output pose

Screenshots attached.

Thanks.