Hi @merandamasse, here is a screen recording:
Here I am going in the other direction (replacing original particles with downsampled) but it is the same idea - does this make it clearer?
Basically if your job is in the “building” state you can expand the particles component to reveal subcomponents (corresponding to particle images, alignments, CTF info, etc). Those subcomponents can then be individually replaced with subcomponents from another job (in this case the outputs tab of your original extraction job).
Cheers
Oli