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Power automate to teams channel (base 64 is not readable by teams) any alternative ?

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Posted on by Zidan

My users are filling an escalation form which triggers my flow to post to teams channel.

I am trying both sending an email to the channel em address or posting directly.

The only way I got attachments to be embedded is via base 64. however it seems that teams can't read base 64 and display my image in the post directly (not as attachment).

Can Anyone assist ??

both displayed as follows in teams channel

Categories:

Building flows

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Shujaath_Khan 1,111 Super User 2024 Season 1 on at

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Hi @Zidan
can you validate two things, please
image syntax to be
<img src="data&colon;image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAUA AAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO 9TXL0Y4OHwAAAABJRU5ErkJggg==" alt="Red dot" />
2. and also if you're having bytes as content, please try to convert to base64

base64(outputs('Get_file_content_using_path')?['body']?['$content'])

Thanks
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Zidan 4 on at

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@Shujaath_Khan CAn you please clarify a little bit ?

I am sharing my flow exactly in details, different images can be uploaded, as I am capturing the image from a form submitted by numerous people.

after calling this attachment (whatever it is) I am trying to paste it to the teams channel using the steps you see above.

Which is working if I am posting to an email, however seems that teams doesn't accept base64 and not able to display the image hence it shows as broken as you can see.

So I am asking if there is an alternative I can do other than base64 in this case ..

I am using this FYI : <img src="data:@{outputs('Apply_to_each')?['body']['$content-type']};base64,@{outputs('Apply_to_each')?['body']['$content']}" />

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v-yujincui-msft on at

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Hi @Zidan ,

Maybe you could try to use String variable instead of Array variable.

I have made a simple test for your reference.

<img src="data&colon;image/jpg;base64,@{body('Get_attachment_content')?['$content']}" alt=""><br />
body('Get_attachment_content')?['$content']
variables('variablename')

Result Screenshot:

In addition, here is a link for your reference.

https://powerusers.microsoft.com/t5/Building-Flows/Posting-an-Image-on-an-HTML-Table-for-an-E-mail-update/m-p/1651076#M183461

Best Regards,
Charlie Choi

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Zidan 4 on at

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@v-yujincui-msft

Seems like it is about to work, however I am getting this error from the last step
"{"error":"The payload is too large. Please make sure the size is less than 28KB."}"

even when I tried with 23 kb picture.

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v-yujincui-msft on at

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Hi @Zidan ,

It's a known limitation.

When posting a message, the message has a size limit of approximately 28KB. This encompasses all HTML elements like text, images, links, tables, mentions and so on. If the message exceeds 28KB the action will fail with an error stating: "Request Entity too large".

https://docs.microsoft.com/en-us/connectors/teams/#known-issues-and-limitations

https://docs.microsoft.com/en-us/microsoftteams/limits-specifications-teams#teams-and-channels

https://github.com/microsoft/BotFramework-Services/issues/228

In addition, one approach we could try is to send each image separately. It should work if the message size is less than the limit.

Result Screenshot:

Best Regards,
Charlie Choi

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