Brightspace D2L Links Breaking when I move lesson web pages around

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Hi all. I’d appreciate any help or advice related to a D2L issue. When I copied over my course from a previous semester and moved sessions around (flipping the front half and back half of the course), EVERY link to EVERY word document, web page, or pdf broke. When I go into the back end (“manage files”) of the course, I can see that all docs are right where I put them, but when I go in from the “front” end (card and each lesson’s web page), I cannot even link to the existing files because I get a “no files found” message. Has anyone else had this problem? Does anyone know an easy fix before I lose my mind fixing all the links on every lesson? TYIA!