[Bug]: Webdav with mailbox.org

[anton-mls]

Bug Description

This might be rather a question then a bug, I hope that this is the right place.
I struggle with the remote file picker: I tried all of the following variants to enter the webdav link

davs://dav.mailbox.org/servlet/webdav.infostore/
webdavs://dav.mailbox.org/servlet/webdav.infostore/
https://dav.mailbox.org/servlet/webdav.infostore/
https://dav.mailbox.org/servlet/webdav.infostore/Userstore/User%20Name/notes

( https://kb.mailbox.org/en/private/drive-article/webdav-for-linux/ )

but I always get error "the specific remote directory doesn't exist". So my question is in what format does celeste attend these links? Or is this an issue on the mailbox side?

Installation Source

Flatpak

What version of Celeste are you using?

0.8.3

Storage Provider

WebDAV