This issue was addressed in a prior post, and I have a very similar situation, however it is sufficiently different that a new post is justified.
I have an SSIS package with a For Each file loop. In Visual Studio 2017, the package behaves exactly as expected in debug mode. However, once I deploy the package to my SQL server and run it from there, I receive "The For Each file enumerator is empty. The For Each File enumerator did not find any files that matched the file pattern, or the specified directory is empty." The package itself exits with success, this error logged as a warning, and suffice to say, my target table remains empty.
Unlike the previous poster experiencing this issue, I have been using a UNC path for my source folder (values genericized):
I have validated that the SQL Account and SQL server itself have rights to my target share and files. I have changed the Integration Services service to use a known good domain account. I do not see any access denied errors, etc. What am I missing?