Hi Jaganath Kumar ,
Thankyou for using Microsoft Q&A platform and thanks for posting your query here.
As per my understanding, you are trying to copy the files dynamically by making use of wildcard file path and storing the source file names in a config file. However, the results are not coming as expected. Pipeline are succeeding, however, it is not copying the file.
Could you please share what expression are you using in filter activity and check what is the output of filter activity ?
Additionally, kindly try to perform data preview in the source , provide the value for source location and fileName for one of the entries and see what is coming as the output of data preview. If it is also blank , or not.
I tried your scenario from my end and it was working perfectly fine. Please share the above details. Thankyou