External File Links Randomly Broken

Hello! I have 15 courses (modules in a larger course curriculum) that all need to launch a Powerpoint file. I've followed the steps to attach the file to the Resources tab. Then, created the trigger on a text hyperlink to point to the external files folder in the Storyline output.

We have a two-step process for loading the file into our SuccessFactors LMS:

1. We publish to our local drive and zip the file into AICC, SCORM 1-2 and SCORM 2004.

2. We upload the file to our LMS team's Sharepoint site.

3. The LMS team downloads the ZIP file to their local drive, then upload it to SuccessFactors.

Somewhere along the way, the links to the external files folder gets randomly broken. I don't know if it's a glitch in our download/upload processes (there are, admittedly, three opportunities to have the file get corrupted). Sometimes, the links work. Sometimes they don't. It seems random, so I wonder if it's an issue with how the speed at which the files are uploaded by the network or if it's something else.

Has anyone else experienced this? How do I fix it? These 15 files need to be accessible in our LMS ASAP and I've already spent two days trying to troubleshoot the issue.

Thank you!