Thank you for your interest in FileCloud!
Unfortunately, we don’t support this distro Openmediavault. So we are not able to help you with this problem.
Can you please try with one of our supported distros. We recommend this because, in the future, you may run into other distro-specific issues with your installation.
You can use Windows 2012, 2016, Ubuntu 16.04, 18.04, Centos 7.
I’d like to add my other folders on the servers (which I access through SMB on my PC per example) in order for me to access my files from outside my network (I mean, other than my FileCloud files).
In this case, Filecloud have the option Network share, you can know more about it from the below documentation