Images disappeared

Something terrible happened my images disappeared:

Or got broken.
How can I get them back?
What went wrong?

Could be because I used Folders instead of Documents?

Tried to ad a brand new image and that is gone too:

But the image does appear briefly. So I guess it is some rendering problem.

Is this a bug?

It does not working in the browser version too:

Please contact support using the “Message Support” button accessible from the ? button in the lower right of the app.