Btw I am using version: 8.4.10956
I solved the problem by commenting out 3 lines in function upload_file in /include/image_processing.php
if(isset($newval)){update_field($ref,$read_from[$i]['ref'],$newval);}
update_field($ref,$filename_field,$filename);
update_field($ref,$filename_field,$original_filename);
Line numbers will vary, just search for them.
Hope it helps somebody