This is fairly easy, just login into your MBS Cloud Account via Web Browser and create a shared link from the file you want to share in your Nextcloud.
If you want to use the link for direct download you can do so by apprehending the shared link with /download on the end.
Example:
Shared Link: https://gforce.mbsclouds.net/s/3f9Az5wWx5rLgzF
Direct Download: https://gforce.mbsclouds.net/s/3f9Az5wWx5rLgzF/download
