Hi Aditya Verma ,
Welcome to Microsoft Q&A platform and thanks for posting your query here.
As per my understanding you are trying to use the "After completion" feature to move the source file after successful copy of the data in mapping dataflow. However, it's not working as expected in your case.
I tried to repro your scenario where I am trying to move the source file from one folder in ADLS container to a subfolder after successful competition of data copy and it is working as expected, unlike your case .
My observation is that we do not need to mention the file name in the 'to path ' , we just need to mention the folder/subfolder path without appending filename.
Also, kindly validate if other transformations till sink transformation ran successfully or not , and sink file got created without any issue or not. After its successful copy to sink, source file should be moved with data.
Kindly share the screenshot of entire dataflow configurations including source and sink settings. Thankyou
Hope it helps. If it resolved your issue, kindly hit on Accept answer
button else kindly share more details for better help. Thankyou