Hi @arkiboys ,
Thank you for posting query in Microsoft Q&A Platform.
When we write to write data into same location same file, then Files will actually get overwritten. There is no way we can append data into existing file using copy activity
You need to consider having SQL table may be in this case. Or you can also consider written data into different files every time and then you are writing to read data back, read data from all files at same time as single dataset. This video helps you to get idea how to read all files data as single dataset.
Hope this helps. Please let me know if any further queries.
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