Just because it comes up now and again, something I can easily link to about one of the nodes in a workflow I often use.
This is just a slightly edited copy of a comment thread so excuse the formatting, but all the detail is there. The first part is the initial query, then my response, then someone else's follow-up.
Edit: Finally, added an important note about how to link the two nodes.
I’ve been trying to follow your workflow, but I keep running into an issue where the "workflowwanparam" node cannot be found. It doesn’t appear under Missing Custom Nodes either.
it's a custom node which is part of a Patreon-only workflow.
Due to that, I can't share the workflow itself, but looking at the details it says its a Group Node combining "EmptyHunyuanLatentVideo" and "KSampler".
You can load those two nodes in separately, then Ctrl-click to select them both, then right-click "Convert to Group Node".
You can then name the node - I'm not sure (as I already have it loaded in), if you can just name it "wanparam" and it'll work, or if you'll have to give it another name and then replace it in the workflow.
In case it helps, after loading your sample workflow from about a month ago, that node was available for me to use without the above conversion. Not sure how that worked, but also not complaining.
From your explanation it was easy enough to add EmptyHunyuanLatentVideo and Wan Video KSampler nodes and use both of them in place of the single wanparam node, too.
NOTE: Before combining the nodes (or you can leave them ungrouped), you need to link the "Latent" output from "EmptyHunyuanLatentVideo" to the "latent_image" input on "KSampler".