Image in word document

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Posted on by gcalab

Dear sir,

I need to put some image in a word document...

In my flow I have a "Compose" action with this expression

concat('data:image/', last(split(outputs('Ottieni_metadati_file_CLP1')?['body/Name'], '.')), ';base64,', base64(body('Ottieni_contenuto_file_CLP1')))

than I set a string variable with this value and after is inserted into the "populate word document" action.

But I have this error message:

Action 'Populate_a_Microsoft_Word_1_Template' failed: The image is not of type PNG or JPG. Please provide an image of type PNG or JPG

but my file is a jpg file (I have another compose where I see it).

Can some body help me ?

Thanks in advance

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Building flows

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Jon Unzueta 1,827 Super User 2025 Season 2 on at

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@gcalab

Thanks for the detailed explanation! The issue you're encountering is likely due to how the MIME type is being determined in your concat expression. Even though your file is a .jpg, the expression:

last(split(outputs('Ottieni_metadati_file_CLP1')?['body/Name'], '.'))

only extracts the file extension, which might not always match the actual MIME type required by the "Populate a Microsoft Word Template" action.

Solution

Instead of relying on the file extension, explicitly set the MIME type to ensure it's either image/jpeg or image/png.

Try modifying your Compose expression like this:

concat('data:image/jpeg;base64,', base64(body('Ottieni_contenuto_file_CLP1')))

Or, if you're sure the file is a PNG:

concat('data:image/png;base64,', base64(body('Ottieni_contenuto_file_CLP1')))

Why this works:

The Word template action expects a valid data URI with a correct MIME type.

Using image/jpeg or image/png explicitly avoids issues with incorrect or unsupported types like image/jpg (which is technically not a standard MIME type).

🏷️ Tag me if you have any further questions or if the issue persists.

✅ Click "Accept as Solution" if my post helped resolve your issue—it helps others facing similar problems.

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stampcoin 5,058 Super User 2025 Season 2 on at

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@gcalab Hi,

I think it takes jpeg or png, not quite sure..

please try this one instead.

concat( 'data:image/', if( equals(toLower(last(split(outputs('Ottieni_metadati_file_CLP1')?['body/Name'],'.'))),'png'), 'png', 'jpeg' ), ';base64,', base64(body('Ottieni_contenuto_file_CLP1')) )

also make sure you read the limitation.

Known issues and limitations

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gcalab 58 on at

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Dear Stamcoin and Jon,

first of all thank you for your time, but unfortunately I keep getting the same error "The image is not of type PNG or JPG..." Is it possible for you that the action "populate a word document" doesn't work with base64 files?

Alternatively, how I can put my image inside word with an object variables ?

Thank a lot for your attention.

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stampcoin 5,058 Super User 2025 Season 2 on at

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@gcalab Hi,

I think you don't need the compose.

when you specify the value for the field in the word template.

just choose body('Ottieni_contenuto_file_CLP1')

received :

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gcalab 58 on at

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Dear stampcoin,

that's right... it's simpler than I thought.

Thank's a lot for your time, thanks also to Jon.

You have a coffee payd if you came in Naples (Italy).

Thanks again.

Gennaro

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