Thank you for posting query in Micrsoft Q&A Platform.
For
LOCATION
use values as'/'
. This will take files of format specified from root folder and sub folders. In your case container is your folder and inside which you have only files. So it automatically takes data from all files.
Please note, schema of data in every file should be same to see expected results.
Hope this helps. Please let me know if any further queries.
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