Option to show all files in cloudstorage also not supported by KOReader. We can also download any file.
To show all files in CS we need to enable option Show unsupported files in file manager (introducing in #5129)
Close: #5006
Addition of WebDav to the CloudStorage. The functionality is the same as with Dropbox and FTP, it is possible to browse the files on the server and download a copy.
Tested with:
NextCloud
HubZilla