First of all, I love Paperpile! Thanks for the great product.
I use it quite a bit in conjunction with LaTeX, and specifically with REVTeX 4-2. This is a bit tricky because it expects unpublished work such as preprint manuscripts to be designated as @UNPUBLISHED rather than @ARTICLE in the bibtex bibliography file.
Is there a way to change how Paperpile exports preprint manuscripts without manually reclassifying them? Right now it exports them as @ARTICLE without an associated journal, which ends up breaking things unless I manually fix them.