Consider a scenario where you receive pre-aligned micrographs from a microscope facility and start processing them in cryoSPARC. After you obtain your final subset of particles, you want to improve the resolution of your structure by aligning the raw movies in cryoSPARC using Patch Motion Correction. The problem is when you imported your movies, cryoSPARC created a new unique dataset for them, so connecting the new micrographs and the particles from the pre-aligned micrographs to the "Extract From Micrographs" job doesn't work, as there is no association between these datasets. In this case, you can use the "Reassign Particles to Micrographs" job. CryoSPARC uses the filename of a movie to create the filename of its micrograph, which is then used to create the filename of its particle stack. You can re-associate a particle dataset back to a micrograph dataset using the common part of the path, which this job helps you do.