Upload large files from Power Apps to Azure Blob or SharePoint

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Posted on by UA-29071001-0

I'm building a Power Apps solution where users can upload files like PDFs, videos, or images (often large in size, e.g. >100 MB), and I want to store these files directly in Azure Blob Storage or SharePoint — organized by a unique folder (like particular day or timestamp).

My aim is to:

Let users upload files through Power Apps
Convert those files to Base64 (or binary)
Send them via Power Automate to Azure Blob or SharePoint
Upload them into the appropriate folder

I'm using the AddMediaButton or Attachments control (datacard - to attach file in sharepoint, created in form itself for attachment) , but I’m running into an issue:

The control only returns appres://blobmanager/... URI (not the file content)
I cannot access AttachmentContent or extract Base64 from it.

I tried using:

But it doesn’t give me the file content either.

❓Questions:

How can I extract the actual file content (Base64 or binary) from the uploaded file?
Is there a better way to handle large file uploads to Azure Blob from Power Apps?
Can I do this without using SharePoint or Dataverse as intermediaries?

Appreciate any suggestions, workarounds, or sample solutions. Thanks!

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Power Platform 1919 2,233 Super User 2026 Season 1 on at

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Hi @UA-29071001-0,

Power Automate has limitations that it cannot send more than 100mb request payload between action and triggers.

Link : https://learn.microsoft.com/en-us/power-automate/limits-and-config#message-size.

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Power Platform 1919 2,233 Super User 2026 Season 1 on at

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Hi ,

Adding to the discussion

You can try using Power Automate (V2 trigger)that reliably handles file uploads from Power Apps:

Steps:
In Power Automate:
1. Use the “Power Apps (V2)” trigger.

2. In the Create file action, set the fields like this:

in File name property use

triggerBody()['file']['name']

in File Content property use

triggerBody()['file']['contentBytes']

Complete Flow pic:

In Power Apps Side:
Set the Submit button’s OnSelect formula as:

Upload_Attachments_to_Onedrive.Run( { file: { name: First(Attachments.Attachments).Name, contentBytes: First(Attachments.Attachments).Value } } )

Note: This setup will upload only one file per run from the attachments control.

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