SharePoint Document Issues

How to Upload Multiple Power Apps Attachments to One SharePoint Item

Maira Mehtab Sep 22, 2026 868 views

Question details

The user wants to upload multiple file attachments from Power Apps and attach all of them to a single new SharePoint list item, avoiding the creation of separate list items for each file.

Product: Power Apps and SharePoint
Device & OS: not provided
Scenario: Submitting a form or data collection via Power Apps that includes multiple file attachments intended for a SharePoint list.
Observed behavior: Using the ForAll function creates a separate SharePoint list item for each attachment, whereas using First or Last only uploads a single file to the item.

Before you start

Ensure you have the necessary permissions to create and trigger Power Automate flows, as well as edit access to the destination SharePoint list.

Solution 1Recommended

Use a Power Automate Flow to Process Attachments

Since Power Apps' native ForAll function iterates and creates new items per file, you must use a custom Power Automate flow to first create the single SharePoint item, then loop through the files to attach them to that specific item.

To achieve this, you need to pass the attachment data from Power Apps to Power Automate as a JSON array. The flow will handle the creation of the list item and subsequently append each file to it using the generated Item ID.

Prepare the Attachment Data in Power Apps

In Power Apps, use the JSON function to convert your attachment control's output into a JSON string so it can be passed to Power Automate.

Create a Power Automate Flow

Go to Power Automate and create a new Instant Cloud Flow triggered by Power Apps (V2). Define a text input parameter to receive the JSON string.

Add the 'Create Item' Action

Add the SharePoint 'Create item' action to generate the single target list item in your destination SharePoint list.

Parse and Loop Through Attachments

Use the 'Parse JSON' action on the data passed from Power Apps. Then, add an 'Apply to each' control to iterate through the parsed attachment array.

Add Attachments to the SharePoint Item

Inside the 'Apply to each' loop, add the SharePoint 'Add attachment' action. Use the Item ID from the 'Create item' step, and map the File Name and File Content from your parsed JSON data.

Community Support: For specific implementation formulas and JSON schemas, it is highly recommended to post your exact scenario in the Microsoft Power Platform Community, where experts provide detailed flow templates.

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Frequently Asked Questions

Why does ForAll create multiple SharePoint list items in Power Apps?

The ForAll function iterates through a table (such as an attachment control's output) and executes the Patch function for every single record individually. This naturally results in a distinct SharePoint list item being created for each attachment.

Can I use the Patch function to save multiple attachments without Power Automate?

While it is technically possible to Patch multiple attachments directly to an existing SharePoint item using a complex form submission process in Power Apps, creating a brand new item and attaching multiple files simultaneously usually requires a Power Automate flow to ensure reliable execution.

How do I pass multiple attachments from Power Apps to Power Automate?

You can convert the attachment control's output into a JSON string using the JSON() function within Power Apps. Pass that string as a text parameter to your Power Automate flow, and then use the Parse JSON action in the flow to extract the individual file names and their base64 contents.

Document & File Issues