A simple plugin for Zotero 7 that mooves attachments and links them
Download the latest release here
Note that you have to right click the .xpi and save link as.
To set up with 3rd party syncing services, set the Linked Attachment Base Directory to the synced folder.
Then point ZotMoov to that same folder.
If you want to moove already existing files to the ZotMoov directory, you can right click them and use the appropriate menu item.