Android reading/annotation app which works with WebDAV?

[studiosus]

Does anyone have any good suggestions which app can read (pdf) files directly from WebDAV and, after adding annotations/highlights, saves/syncs them back to WebDAV?

So the final version of the file is always on WebDAV (and I can access it with my PC pdf reader).

For years, I have used Moon+ Reader, but its WebDAV functionality is limited: it does allow reading books directly from WebDAV, but if you change the file that is directly read from WebDAV, it won't save the changes back to WebDAV (but instead, to some of its own cache folder).

So does anyone have other good ideas or experience of how to make it work?!