[mdaniel]

I wasn't able to find a reference for the yaml schema faster than I can open the "add comment" page, so apologies if this is address by some docs somewhere:

Given that `steps:` is a list, isn't having `after: video-clipping` redundant, since it already comes after the video-clipping step?

[edouardb]

The `after` attribute is present to let you implement your processing logic. The steps list contains the processing actions but it is not a sequential execution. The workflow can have multiple processing branch and perform a series of processing on the result of a specific step.