Check this out from our Bot Store:

https://botstore.automationanywhere.com/bot/merge-multiple-pdf-documents-into-single-document

There are others, too, so check them out.

You can use the String: Split action to extract all the file names in the dictionary value and save them as a list.

Then, you can use make a copy of the first item in the newly generated list, which is located at index 0, and give the copy the name of the dictionary key.
Note: Don't forget to add '.pdf’ to the dictionary key.

Next, iterate over each one of the values in the list from index 1 to index List:size -1.

• The loop must start from index 1 to skip the first item in the list because that's the file that will be copied and used as the base.
• The size of the list minus 1 is equal to the last index of the list.

Finally, use the PDF: Merge documents action as shown in the following image:

You can find the source code of the bot shown in the image in the next link: 
A360-Merge_PDFs_from_dictionary.json - GitHub Gist
You can use this extension to import the source code to a task bot: 
Bot Assistant - Chrome Web Store (google.com)

I suggest using this bot store package. 

https://botstore.automationanywhere.com/bot/pdf-utilities-package then use this action: 

• Merge all PDF files in a directory
   

  

   

​@AryanGuru did any of the above suggestions help? Please mark as best answer if they did!