in upload files activity try to give your input with below syntax
LocalResource.FromPath(CurrentIEnumeratorOFText)
or
when getting your files from directory use
use below syntax in Assign activity
Directory.GetFiles(“Path”).Select(function(x) LocalResource.FromPath(x)).ToArray
delete existing for each take one new for each then give new array variable,
then you can directly use currentitem without above syntax
happy Automation