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Flow with approval and null attachment

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Posted on by ademboski

Hi, I have a flow which has a Microsoft Form as its source data which has a branching question which asks for a file upload. As such, not all submissions have an attachment. While I found the solution to allow the flow to run without an attachment by using a condition with the upload field is equal to "null", which does allow it to the next steps... the approvals step further down is failing stating BadRequest. The request failed. Error code: 'InvalidAttachmentName'. Error Message: 'The attachment name '<null>' is invalid.'.

Is there any way to handle the null attachment within the approval to allow it to proceed even if a file is not attached?

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BCBuizer 22,505 Super User 2025 Season 2 on at

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Hi @ademboski ,

Maybe not the most elegant solution, but it will get the job done: https://powerusers.microsoft.com/t5/General-Power-Automate/Can-MS-Flow-Send-An-Email-With-An-Empty-Attachments-Array/td-p/275470

Basically create two versions of the action: one with and one without the attachement. Then have insert a condition to determine if there is an attachment and execute the corresponding action.

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ademboski 52 on at

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Hi, while I do understand the solution proposed, I dont understand how to exclude the attachment field from the approval even though its taking the path of no file attached. I am not including the attachment field on the approval; it is just that the approval sees the field from the get response details being a file attachment field which is empty and it fails. I did not pick up from the link how that could be excluded. I am doing the very similar process in my screenshot of taking path for when an attachment is not present, which did allow it to get to the approval step, but the approval still sees the field.

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BCBuizer 22,505 Super User 2025 Season 2 on at

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Hi @ademboski ,

Can you please post a screenshot?

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ademboski 52 on at

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Hi, I did post a screenshot.

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