In Canvas, adding new files to a module that already has prerequisites or requirements typically won't reset a student's existing progress, unless you specifically add the new file as a required item within the module settings.
If the new file is just added for reference (and not marked as a requirement), students should retain their progress and access to future modules. However, if you do make the new file a requirement, students may need to open or view that file for the system to count the module as "complete" again—but it won't reset what they've already done in subsequent modules.
To be safe:
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Avoid adding the new content as a requirement if you don’t want to impact progress.
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Or, clearly communicate to students that they may need to open the new file to maintain module access if it’s added as a required item.
Hope that helps keep things smooth for your learners