I am looking for ways to get TagSpaces to be able to access WebDav file system like NextCloud.
Better still, if it can be made as an app for NextCloud or can be installed on NextCloud.
This was possible some year ago, the old WebDAV implementation was removed, due to unsupported webdav library. Now we have an experimental webdav support and you can connect a webdav and probably nextcloud servers as location:
Unfortunately this feature is not production ready, since it missed a lot of basic functionalities and we currently do not have the resources to fully implement it.