Can I upload data from server to the mobile app into a form? Can I see prior entered data in the mobile app?

Hi @Scheffti

We're glad you're here. When you get a chance, please introduce yourself on this forum thread. I'd also encourage you to add a real picture as your avatar because it helps build community!

when it comes to your issue... ODK works in way that you download a form form server than you fill such a form using the mobile app and submit.
If there is something wrong you can edit the submitted form (as long as it's still on your device) and upload again but there is no automated mechanism to for example review a submission on a server side and ask enumerators which use that form to edit something.