I have an SSIS (2012) package which was written by one of the developers. I've been tasked to with fixing the error. Each time the package is run I receive the following three messages indicating the Write Output File  produced errors.
Transform File and create output file:Error: Write Output File failed the pre-execute phase and returned error code 0xC020200E Transform File and create output file:Error: Cannot open the datafile "\\servershare\folder\file" Transform File and create output file:Warning: Access is denied.
I have tried granting full control to the folder share to myself, the SQL Agent account, and the SQL Services account. Whether I run the package as myself or as a service account I receive the error messages.
I'm not seeing any more details in the SQL Server error logs or the Windows Event logs.