Combine PDF's Yosiminite

Was having some trouble figuring out a solution for this myself and wanted to help others and remind myself how to do it, should I forget. I am new to editing videos so is a bit rough around the edges. Hope it makes sense.

[@suziepark7476]

Oh, phew! This was a simple and effective tutorial I found on a thread you posted to.
After seeing you struggle with dragging each file into place and how it might be difficult to figure out which you'd dragged and which you hadn't, I tried doing something differently. I cmd+A then cmd+click on the first document to deselect it, then dragged the first of my selected items on top of the first document - if you have a multi-page document I think you have to expand and drag to the last page of it. Bingo! All in one go versus one by one. This is of course if your documents are in the order you want them to be. It worked! Still messed up my first file but maybe someone will fix that problem.
Thanks!

[@SherriSegovia]

thank you so much!