Hi @Quentin CHIFFOLEAU ,
Welcome to Microsoft Q&A platform and thanks for posting your query.
As I understand your ask, you are trying to data from multiple files into a single file and issue here is that the schema for all the files is not matching. There are differences in the columnNames. Please let me know if my understanding about your query is incorrect.
Unfortunately, it can not be achieved by copy activity. You need to use mapping data flow to achieve this requirement.
You can use Select transformation inside Mapping data flow to change the column name from the source. Also , to merge the data from multiple files, you can make use of Union transformation in mapping data flow that will combine multiple data streams into one destination.
For more info, please watch the following videos:
select transformation in mapping data flow
union transformation in mapping data flow
Hope this will help. Please let us know if any further queries.
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