Timeline went missing after reopening a Team Project

Hey,

I'm working on a team project. After I saved and shared my project I closed it. After reopening, my timeline is missing and there is an offline file. My first thought was that this file was my timeline... But it is way to short. If I look at my auto-saves in the cloud I can see that those files should be timelines(if the icons are acurate) but if I want to open them, the media is offline. Interestingly enougth another timeline, that is just a nested sequence, works fine. 

I'm on a Windows 10 machine and I'm using PP 23 Build 63

Help is much apreciated.

Thorben