Trigger a condition only if the filename contains a specific words

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Posted on by francescodono

Hello,

I am new to power automate and I am having trouble on what seems a really stupid question.

I want to trigger an avent when a file is created and doing some other things only if the filename contains a words (that is "Allegato).
I tried to trigger the event, but the condition is always false. This is my flux

This is how I set the condition:

I tested it and the condition result is "False". But this is the output generated:

So, in the name I see that the word "Allegato" is contained. But I cannot understand Why the condition is false

Thank you

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David_MA 12,982 Super User 2025 Season 2 on at

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If you want the flow to only trigger when the filename contains Allegato, you would not use a condition as the flow will still trigger if the filename contains the word. What you want to do is add a trigger condition, which you correctly identified in the title of your post. It is just that the implementation is off.

Go to the settings of your trigger and go to Trigger conditions. Press +Add to add an expression, which must evaluate to true for the flow to trigger. To check what you want, you would use this trigger condition:

@contains(triggerOutputs()?['headers/x-ms-file-name-encoded'],'Allegato')

A tip for building a trigger condition is to use a compose action and build the expression in it with the expression builder. You can then trigger the flow without the trigger condition set to make sure it returns true or false. Once you have it working, just copy the expression and put the @ symbol before it in the trigger condition:

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HaveeLand 74 on at

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Hello @Francescodono

To me... you are on the right track with your Power Automate Flow. You may only have to include the word "ALLEGATO" in Quotes for it to work. I tried it and it worked for me.

I believe that without quotations, it may try to process it as a variable or something else. Try the Quotes and let me know.

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francescodono 21 on at

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@David_MA
Thank you so much for your answer.

I tried your solution but it seems that there is a problem. As you can see I uploaded the file in the specific folder I chose.

But Nothing happens. I have this screenshot:

This is my implementation:

Edit: When I analyze my flow I have a message that is: "
InvalidTemplate. Unable to process template language expressions for trigger 'When_a_file_is_created' at line '1' and column '46576': 'The template language function 'contains' expects its first argument 'collection' to be a dictionary (object), an array or a string. The provided value is of type 'Null'.'.

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francescodono 21 on at

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Hello @HaveeLand,

Can I ask you how you implement the Compose that is in your image?
Thank you!

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