What does activate keysync mean?
I don't really understand what the option "activate keysync" means. It appears in the context menu of every conversation. Can anyone explain?

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Hermann commented
see https://guardianproject.info/apps/keysync/
How To Sync To ChatSecure
To sync between ChatSecure and your desktop apps, First plug in your phone or device
via USB. Start KeySync and it should automatically detect your device. If KeySync cannot find your device, it will save the file for you to manually copy the otr_keystore.ofcaes file over to your device’s SD Card, where ChatSecure looks for it. Once the file is in place on your device, start ChatSecure. In ChatSecure, go to the Accounts, then select Activate KeySync from the menu. This will guide you to scan the QRCode that KeySync shows you in order to complete the sync.