OOB dam update workflow triggers when you upload to any folder below /content/dam, If you have configured launcher for any folder below /content/dam then it is expected because you are trying to run 2 workflow for same payaload at same time which is not supported. In that case call your workflow at the end of dam update workflow.
If it is not /content/dam then logs whould give enough information why it is failing & fix issue accordingly.
OOB dam update workflow triggers when you upload to any folder below /content/dam, If you have configured launcher for any folder below /content/dam then it is expected because you are trying to run 2 workflow for same payaload at same time which is not supported. In that case call your workflow at the end of dam update workflow.
If it is not /content/dam then logs whould give enough information why it is failing & fix issue accordingly.