Why are you using "submitted to workflow" for AF, when you are not invoking the workflow on AF submission? You are invoking the WF through code, right? You should use, "Absolute path of AF instead". I tried the same, and it is working fine for me, and I am able to attach the files, as per the advanc...

As I stated earlier, you need to configure the same as below:  

You may still use AF/PDF's attachment component, as you will have to anyhow render AF/PDF while opening the assign tasks.This is the only way to propagate attachments through assignTasks in Forms OSGi workflows, as prefilling of task attachments is not supported yet. 

You may still use AF/PDF's attachment component, as you will have to anyhow render AF/PDF while opening the assign tasks.This is the only way to propagate attachments through assignTasks in Forms OSGi workflows, as prefilling of task attachments is not supported yet. 

@crich2784You don't nee to configure to prepopulate or submitted settings of assign task, if you are not invoking the workflow from AF submission, You may use Advanced tab, in assign task's props, if you want to attach files while reviewing the tasks. Hope this helps. Thank you!

Are you invoking this workflow on AF submission?If yes, then you need to attach the files in the AF itself before invoking the workflow.

Can you please share the screenshots of the AssignTasks props as I have shared above?Why your AssignTask1 prepopulate for attachment is blank? That's not in my case. AssignTask1Prepopulate - blank.

@crich2784 this is my workflow: I am attaching 2 files in my AF, and I am submitting and invoking WF above. Assigntask 1 props: Assigntask 2 props:  After completing both the assign tasks, I am able to pass and submit both the attachments and store them at the payload path, as shown below:    

as per my previous response, you can't assign a document array variable as the attachment in assign task operation, as it accepts the attachments from the payload only. So, you better use a file attachment component in the form to achieve this use case.