I have created a document library named “K2 Workflow Library” in which K2 workflow will be created to check in document. Please refer to my previous article to create a K2 workflow in SharePoint 2013 Online.
Go to K2 designer, drag and drop Check In Document step from the Documents workflow steps in the ribbon interface.
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Specify the document that has to be checked in and then click on Next button.
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Specify a check in comment and options for checking in and then click on Finish button.
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Deploy the workflow. Select a document in “K2 Workflow Library” library which has been checked out and run the workflow.. After few minutes the workflow will be completed and the document will be checked in.