Storyline Course - Moodle 3.10 - Video in activity not loading in safari

Good Evening,

After some further tests I got some results:

Scenario 1: 

I tried to upload the articulate scorm package to scormcloud with the setting Jürgen mentioned. I had to remove some slides because of scormclouds 100mb restriction. 

After I deleted 2 scenes I was able to upload the package - and everything seems to work.

Scenario 2: 

I uploaded the same scorm package to our moodle instance - everything also worked fine.

Scenario 3:

So I tested the previous version of the scorm package again, and its not working again. Frankly, everytime I try to load the scorm package one file of the scorm package seems to load endlessly. In my latest test it was the analytics-frame.html file. Even though the file is not that big it just never finishes loading.

So after all these 3 scenarios I can just tell I probably need to check the slides I deleted - but I would like to know why it is not working only in safari. Its working completely fine with firefox and chrome on my Mac. 

Does anybody have any hint for me why Safari is so special?

Cheers 

Torsten