From my deep memory, being the partner preparing the 1065, my recall is you need to file as the paid preparer.  

Are you compensated for doing the return seems to be the determining factor. 

https://www.irs.gov/instructions/i1065x#:~:text=from%20the%20REMIC.-,Paid%20Preparer's%20Information....

Honestly, how important is this distinction?