Ok, this definitely helps.
For students on laptops, I recommend that those students use Google Chrome or Firefox to export their projects. Other browsers may have issues, so just make sure none of them are using Internet Explorer, Edge or Safari by Default! (Mac vs PC should not cause an issue).
As for the output, an issue students may be experiencing is that on some computers we’ve found that exporting could create a “Corrupted” mp4 file. This issue was fixed in 1.17 (test.wickeditor.com). You may recommend students that are having issues try exporting in this version.
The sounds from FindSounds should not be an issue!
Lastly, if students are using phones, phone browsers are not yet optimized to be running wick editor. I’d recommend those students send you a .wick file directly, as opposed to an .mp4, as exporting could potentially be an issue on those platforms.
Happy to help keep debugging. If any students continue to have problems, we may be able to work through their projects individually.