1. This is how you download machine code:
   https://help.codesys.com/webapp/_cds_loading_application_login_starting;product=codesys;version=3.5.15.0

2. This is how you download source code:
   https://help.codesys.com/webapp/_cds_loading_sourcecode_to_from_plc;product=codesys;version=3.5.15.0

You will notice that they are two separate things.

So day 1, John might download both machine code and source code and they will be the same.
So day 2, Frank might make changes but download only the machine code.
Now day 3652, You hit upload source from controller, and you don't have Frank's changes! Because Frank only downloaded the machine code.

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Problem with uploading project

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