I really only need a one-way sync, so I'm hoping Butler would work for this, but I'm trying to create a rule so that when an attachment is added to a card, Butler finds the first card linked, and adds the attachment to that linked card.
I got really close because I can find the attachment link and add that link as an attachment to the link card, but for things like images, this isn't seen as an image link so is therefore not reviewable and also not treated as a downloadable item from the File Manager Power-Up.
Anyone know how to do this, aside from using Unito?