I have recently been trying to solve a PDF renaming task with Dynamo. Currently Revit is automatically generating a file name for hundreds of PDF’s we are printing. The current format is, FRIEDMAN_CENTRAL_R17_ALucree - Sheet - G004 - CODE DATA.PDF, our desired format is, G004 - CODE DATA_18-05-04.PDF. As you can see there is also a print date which I think is as easy as adding a date and time node. I am not looking for the whole answer to the problem here because I am new to Dynamo and think this is a good exercise but I am currently stuck on this. In my script I used a Unique Identifier to break the list into pieces and recombine it in the correct format. Currently I would have to do this for every file but I bet there is a way to have Dynamo scan the folder for PDF’s and rename the files in the correct format one at a time. Any help would be greatly appreciated and once again very new to Dynamo so go easy on me.