Dateizugriff trotz Erlaubnis nicht möglich

Sorry to hear this @default29114273nqx4bi 

Is it possible to share a screenshot of what message or error you saw? Are you all on the same school account or is there a permissions issue?  What browsers are you using?

Let's make sure your computer specs meet Ps web requirements:

https://helpx.adobe.com/photoshop/system-requirements-web.html