Overwrite files causes append

> **a60664c** created the issue

If I copy a JPG or MOV file from S3 to the Finder, it works fine...

If I then make a change (or not) on S3, and copy the file again, I get the "resume/overwrite/rename" dialog. I choose Overwrite.  However, it actually appends to the existing file.  So, my local files all get corrupted because they are now twice, then 3 times... then 4x as big.