Describe the bug

The "Open" / "Save as" feature in editors does not work for incoming shares. It's broken for both single file shares as well as for files inside shared folders.

Steps to reproduce

1. Share a text file with admin
2. As admin, open this text file with the text editor
3. Open the context menu on the top and click "Open"

Expected behavior

The file picker opens with the current location.

Actual behavior

It shows an error because the PROPFIND fails.