I will try to concatenate PDF files but have an error “Object reference not set to an instance of an object.” Error executed when call concatenate with any file + attached file.
More logs:
System.NullReferenceExceptio…...#=zmm7qa6otiCA9(Document #=zcEvbIbo=, Int32 #=zm5sozsU=, Document #=zSOD0mEg=)...#=z$hZ6xuDz_1hQ(Document[] #=z0RGtjUE=, Document& #=zYtsLn5U=)...