Davfs2
Davfs2 allows you to access resources on a remote server like it would be a local disk, in this case nextcloud.
Install and configure davfs2
Install davfs2:
sudo apt-get install davfs2
Add yourself to davfs group:
sudo usermod -aG davfs2 <username>
Create a directory, and mount it:
mkdir ~/nextcloud sudo mount -t davfs https://files.newro.co/remote.php/dav/files/<username>/ ~/nextcloud
After the mount you will be prompted for your username and password from nextcloud.
If you want to mount a specific folder from nextcloud simply add the path after <username>:
sudo mount -t davfs https://files.newro.co/remote.php/dav/files/<username>/My/Super/folder/Path ~/nextcloud
Please unmount the nextcloud directory when finished, makes it harder to scan for big directories in case a VM has storage issues. Plus, you're leaving your nextcloud files exposed to others.
You can unmount the directory like this:
umount ~/nextcloud
Troubleshooting
If you get something like this when mounting /sbin/mount.davfs: warning: the server does not support locks then edit /etc/davfs2/davfs2.conf file and set use_locks 0