PAD Merge PDF Giving Errors

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Posted on by BranJens41

Hello everyone,

I am currently having some issues with desktop flow triggered from cloud flow.

Cloud Flow: OneDrive - When a file is created -> Trigger Desktop Flow

Desktop Flow: Get files in folder (that match with "*" and store them into "Files") -> Move Files (store them into list "Moved Files") -> Merge PDF Files (Merge "Moved Files" into folder and store them into list "Merged PDFs") -> Delete "Moved Files"

I run into an error with the Merge PDF Files action where it either throws a "Value cannot be null" error when the "Moved Files" variable does not include quotes or a "Access to folder is denied" error when the "Moved Files" variable includes quotes. The flow had worked at one point. Then, I'm not so sure what exactly happened, the folder I had created for this flow in our organization's OneDrive and shared with the person who needed access to this flow no longer showed in my file explorer and no longer was able to be contacted by the desktop flow. I had created a new flow and new folder with new subfolders the same exact way I had done so before, yet I am still unable to engage the PDF merge.

Any and all help would be greatly appreciated.

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Power Automate Desktop

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Deenuji_Loganathan_ 6,250 Super User 2025 Season 2 on at

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@BranJens41

If possible could you please share some screenshot of your flow?

Thanks,
Deenuji Loganathan 👩‍💻
Automation Evangelist 🤖
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VishnuReddy1997 2,656 Super User 2025 Season 2 on at

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Hi @BranJens41 ,

Is this what your trying to build .
As per my understanding i have built a flow.
1.Your BOT will trigger when some files are created in onedrive.
2.You want to move all those files into a Particular Folder called "Moved Files"
3.Once the files are moved, you will get also those files from "Moved Files" Folder and merge it into a Single PDF.
4. And Merged PDF you want to store it into a Separate Folder Called "Merged PDFs".
5.Once it is done you want to delete all the Files from "Moved Files" Folder.

Please find the below solution.
Code:

Folder.GetFiles Folder: $'''C:\\Users\\OneDrive\\Desktop\\Power Automate Desktop\\Practice\\Merge PDFs''' FileFilter: $'''*''' IncludeSubfolders: False FailOnAccessDenied: True SortBy1: Folder.SortBy.NoSort SortDescending1: False SortBy2: Folder.SortBy.NoSort SortDescending2: False SortBy3: Folder.SortBy.NoSort SortDescending3: False Files=> Files
File.Move Files: Files Destination: $'''C:\\Users\\OneDrive\\Desktop\\Power Automate Desktop\\Practice\\Merge PDFs\\MovedFiles''' IfFileExists: File.IfExists.DoNothing MovedFiles=> MovedFiles
Folder.GetFiles Folder: $'''C:\\Users\\OneDrive\\Desktop\\Power Automate Desktop\\Practice\\Merge PDFs\\MovedFiles''' FileFilter: $'''*''' IncludeSubfolders: False FailOnAccessDenied: True SortBy1: Folder.SortBy.NoSort SortDescending1: False SortBy2: Folder.SortBy.NoSort SortDescending2: False SortBy3: Folder.SortBy.NoSort SortDescending3: False Files=> Files
Pdf.MergeFiles PDFFiles: MovedFiles MergedPDFPath: $'''C:\\Users\\OneDrive\Desktop\\Power Automate Desktop\\Practice\\Merge PDFs\\MergedFiles\\MergedPDF.pdf''' IfFileExists: Pdf.IfFileExists.AddSequentialSuffix PasswordDelimiter: $''',''' MergedPDF=> MergedPDF
File.Delete Files: Files

I have framed those logic with my assumption so pls fine tune it as required.

(Note:- if you got your solution you can mark as solution and gives kudos)

Thanks & Regards
Vishnu Reddy

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Agnius Bartninkas Most Valuable Professional on at

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If you have a Premium license, I would recommend using the OneDrive actions instead of relying on the OneDrive app to sync those files for you. This would work much better. Try using List files in folder, then iterate through them and use Get file content on each of them, and then Convert binary data to file to create a copy of the file locally. You can then merge these files as you need them. If needed, you can also use Delete file under the OneDrive actions to delete the original files, too.

While this will require slightly more actions, as you need a loop and cannot really get all files in one go, it will be much more stable and reliable.

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