How can I save the content of my Jupyter?

JupyterLab
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1

Last night I want to finish my work and save the content so that next time when I enter I can continue the project.However, the “save” button cannot be click

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I have to save the workspace.However, after the Jupyter end, I cannot continue the work when I relaunch the lab.How can I solve this problem?

2

Do you have any files open to save?

Are you using real time collaboration extension?