Issue while writing same stage file using two different read operation

Summary

Issue while writing same stage file using two different read operation

Content

I have requirement to write same file with two different type of contents. I am following below steps

1) Download the file to ICS

2) Read the file --> For Each --> map(content 1) -> write the stage file with append mode (Directory a and File name b)

3) Read the file --> For Each --> map(content  2) -> write the stage file with append mode (Directory a and File name b)

4) Zip file stage operation for Directory a

But when I check the zip file , The file have contents only form step 2 not from step 2