Preview doesn't work for any of my projects

I'm working on making some edits of an Articulate-based training for client, and today the preview functionality just...stopped working. No matter which project I try to open (original files they sent, edits I've made or new files I just downloaded), the preview will "load" and then only show the spinning load icon. I had absolutely no issues with this the past week while I was working on other sections of the project.

I run into the same issue when I try to load the edits or original files for the other sections I've already completed. I've tried restarting my device, uninstalling and then reinstalling Storyline, copy & pasting slides to a new project, etc. Nothing seems to work.