Hi there,
We are sorry to hear about your difficulties; this shouldn't happen.
Could you try connecting to a different internet connection while logging into the Adobe Express App, and have you tried rebooting the device after reinstalling the app?
Also, as for the issues related to stock images, I'd like to inform you that yesterday there was maintenance going on in Adobe Stock and Adobe Express. So, it may be a possibility that the issue was linked to the maintenance.
Let us know if you continue to face issues. We are here to help.
Thanks,
Amitej