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Create a file with Power Automate Flow but loses the extension file name

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Posted on by fabtodton40

Hello my friends, how are you?

Thanks again. You already helped me once and now I need one last bit of help to finish my work.

With the help of a friend here, I finished a flow within Power Automate that talks to Microsoft Lists and Microsoft Sharepoint.

Now, I've reached the final part, where the flow takes the contents of the attachment (or attachments) that the user includes when they create a new item. And the flow creates a new file in a specific folder in a specific Sharepoint library.

The creation is working perfectly!

But the file extension is lost when it creates the new file.

For example: If the user attaches a file called ASDFGHJKL.pdf and I want the stream to rename it to

FRIEND.pdf

the flow renames only to

FRIEND

without the extension (.pdf) at the end of the file

If the user attaches a file in PDF or PNG or JPEG or whatever, it renames the file correctly but loses the extension.

Can you help me?

1 (1).png

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Building flows

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Pstork1 68,707 Most Valuable Professional on at

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There should be a dynamic content field that includes the extension. Simply use that instead of Data Vencimento. I'm not sure what it would be called, but if you look at a recent run you should be able to see it in the output of the SharePoint action.

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trice602 15,402 Super User 2025 Season 2 on at

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Hi @fabtodton40 ,

I found a flow I had that does this. I create a new variable and then in this set I am setting the variable using this expression split()

split(outputs('Get_Attachment_(V2)')?['body/name'], '.')[0]

slice(outputs('Get_Attachment_(V2)')?['body/name'], indexOf(outputs('Get_Attachment_(V2)')?['body/name'], '.'))

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Pstork1 68,707 Most Valuable Professional on at

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You would need to supply a '.' in front of the Atype or include it when creating the variable. But you should be able to just use outputs('Get_Attachment_(V2)')?['body/name'] for the filename and have it include the extension. You can still add additional information to the front of the new name.

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trice602 15,402 Super User 2025 Season 2 on at

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@Pstork1 ,

Agreed but most posts here want to append at the end of the file name, not the front so this was something I built a while back and works in testing but not sure if there is a more efficient way to do it.

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fabtodton40 on at

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Thank you for the patience guys.
I got it with this expression

last(split(item()?['DisplayName'], '.'))

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