sample prep method for HPLC multisampler with openlab 2.4

HI I am trying to create a sample prep method for HPLC multisampler with openlab 2.4 to mix a default volume from sample vial with default volume of blank water. I have tried this with caffeine and injection amount appears about 1/4 for the expected amount in sample. Not quite sure if the total volume aspire from both vials is injected (but the inject instruction does not specify volume). Does anyone have a sample prep method example to mix samples from two vials?

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