How do I link two existing folders on different devices?

I have ST installed on two systems and on both of them I’ve added two folders – both folders have content.

When I try to share one folder from one system to the other system it asks about adding a new folder.

I just want to add/link them but I can’t figure out how.

Normally, you would add a folder on one side, then share it with a remote device, and then on that device accept it under a pre-existing path. If you’ve already added them to Syncthing independently though, you can still “link” them by using the same folder ID. The folder ID can be edited in the Advanced Configuration, although I would suggest just removing the current ones, and then re-add them using the first method, especially if you’re not really familiar with Syncthing yet.

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Thank you. I was able to get it to work by changing the folder ID from advanced configuration.