I'm trying to use MultiPart MIME step which reads file data and encodes and store it in a property in bytes - which is then used to HTTP step in post parameters ( As described in documentation). This is working fine when i test for single file. When we have to test with multiple files using "instance" property to read filename and hit HTTP step, most of the time duplicate files are being hit to HTTP step - even though logs are showing correct instance and correct file is picked up.
If i have staging doc as 5 users and stage the TestCase with above 2 steps, results may be like instances of 0,0,0,2,2 instead - 0,1,2,3,4 or any sequence (without repetition). Any quick help is much appreciated.