The lines by themselves disappeared

Hi Amraili_Shukurov, Thanks for reaching out and appreciate sharing your file!
I hear you are encountering an issue with FigJam connectors, however I’m unclear what issue you are facing within your file - could you please tell me more?

I tested on my side by copying the file, and it seems that I can use the connector to draw lines and connect.

It would be helpful if you could share a video recording of the issue with a brief explanation, if possible.
I look forward to hearing from you soon!

Thanks,