Some family tree programs can send your data directly to Genealogy Online. You then no longer have to create and upload a GEDCOM file. Examples are GensDataPro and Geneaal.
For this to work, the program has to know which publication is yours. That is what the publication code is for. It is a secret code that belongs to your publication.
After that, you can publish from your program. The program sends your data to Genealogy Online. Your publication is then updated.
Do not give the code to other people. Someone with your code can overwrite your publication.
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Find your ancestors and publish your family tree on Genealogy Online via https://www.genealogieonline.nl/en/