As Steve suggests, the database module will let you approve submissions to make the visible to others. However, perhaps you're also hoping that inividual students won't see anyone else's approved submissions until their own has been approved?
If that's also the case, then you may need to manually set the permissions for the database on an individual basis.
Sorry if I have misunderstood what you want to do...
Teaching with Moodle
Sharing Uploaded Assignments with Students
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