All files which are copied to a through files mounted WebDAV resource loosing their permissions and owner

## Prerequisites
- [X] I have searched open and closed issues for duplicates.

## Describe the bug
I have successfully mounted a WebDAV resource from my email provider. I can copy and delete files using elementaryOS files manager to it but if I open the copied files with any app all files are write protected. In the properties tab I can see that I have lost all permissions of all the copied files and nobody is the owner anymore. (see screenshot)


### To Reproduce
Steps to reproduce the behavior:
1. Go to 'Connect with Server'
2. Select 'Save WebDAV (HTTPS)'
3. Enter your credentials
4. Create a file in your home directory
5. Check in properties tab inside your home directory
6. Copy this file to the WebDAV resource and check the properties tab again

### Expected behavior
That all files which I copy to the mounted WebDAV resource are writable, that means all permissions and the the owner is kept.

## Platform Information

Please check what applies:
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- [ ] I'm using the latest version from git that I've manually compiled
- [X] I'm using the latest released stable version which was provides from the AppCenter