Locally synced Attachment don't work; says the file doesn't exist in Zotero Server

[Atreyagaurav]

I don't use Zotero Server for the attachments as it has limited storage. I have most of the attachments in my laptop. I copied everything inside the ~/Zotero/storage/ into a folder named storage and assigned that as custom path for Zoo for Zotero app, but it doesn't seem to care about those file that it didn't download itself.

Is the official cloud and webdav the only way to get the files? I though copying the files manually should have worked.