Lightroom Classic cannot export images to a disk mounted by WebDAV

Hi all,

I am using MacOS with Synology NAS and LrC.  I saved all images into the NAS and access those images with my MacBook via a mounted disk under the WebDAV protocol.  Although the mounted disk volume is always "0", I can still add folder and images into the mounted disk by Finder. I can even successfully import those images in the mounted disk into LrC catalog without moving their locations, develop those images, add geotag to images, etc.

However, I cannot save the updated metadata into the images after development, I cannot even export the developed images to the same mounted disk.  It seems LrC compulsory to have spare volume on a disk to proceed the above operations. Unluckily, it is WebDAV's limitation that cannot transfer the figure of spare volume of my NAS (which is about 8TB free space) to the mounted disk.

Now, I can only proceed the above operations after mounting the disk with SMB or AFP protocol.  However, it means I have stay with the same WIFI network with my NAS but I only return home once a year.

Would anyone know any method to resolve the above inconvenience? Will Adobe deliver an update to LrC to deal with the above situation?

I understand there are already many image editing softwares do not need to check the disk space before exporting.