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no, it expects a zip file with already aligned images (for training) or the pointcloud itself (for viewing)

No you still need to run COLMAP

you could also use Metashape

Or Reality Capture which I think can do it for free?

In metashape, you can export the cameras in the colmap format, in RC you might have to convert first to Kapture and so on, afaik.

Yeah this is the next big challenge. There's some ideas what to do, but one step at a time!