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When I set script sync in the library script, Script sync failed - Code must include at least one @match or @include key. is shown.

Library script should not require @match or @include key as this is controlled by userscript not library.

I just tested this, seems to work for me. Which library are you trying to set up sync on, and from what URL?

Hi, I have the same issue I'm trying to sync to: https://raw.githubusercontent.com/Midori-Dragon/Furaffinty-Request-Helper/main/Furaffinity-Request-Helper.js

With this Library: https://greasyfork.org/de/scripts/483952-furaffinity-request-helper