Please note that before approving a document, user must have approval permissions and you should lock the document you wish to approve.
Instructions:
Once the document is locked you will observe that approval button would appear.
Click on the “Approve” link under the “Current Version” box.
A pop window will appear, with the message "Approve version 0.1 and make it a record", click on Approve version, to make it a record.
The approved record Document will automatically version up the next Major version (Whole Number).