It would be great if DeoVR has support for local media assets:
Typically, if you call the file inside a folder: folder.jpg then the system recognize that the thumbnail image should be folder.jpg.
you are becoming the plex/emby for VR.. at least for me even though you are not a server. It would be great if you can have support to customization of folder images and video images.
see how plex does theirs, and come up with your own: https://support.plex.tv/articles/200220677-local-media-assets-movies/