After upgrade to 9.2 you upload an image file via WebDAV. WebDAV client (e.g. Windows Explorer) will show an error, that the source file cannot be read.
Bug in the WebDAV implementation in 9.2 regarding thumbnail generation (and a special way how Windows Explorer creates files via WebDAV).
- For a patch contact support
- Alternatively you can keep 9.1 version of WebDAV running against your 9.2 system. Upload should work, although no thumbnails are created for images.