Yes, that's given in document - https://docs.microsoft.com/en-us/azure/data-factory/connector-file-system
Copy behavior option - Defines the copy behavior when the source is files from a file-based data store.
Allowed values are:
- PreserveHierarchy (default):
Preserves the file hierarchy in the target folder. The relative path of source file to source folder is identical to the relative path of target file to target folder.
- FlattenHierarchy:
All files from the source folder are in the first level of the target folder.
The target files have autogenerated names.
- MergeFiles:
Merges all files from the source folder to one file. If the file name is specified, the merged file name is the specified name. Otherwise, it's an autogenerated file name.
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- Vaibhav