Power Platform Community Forum Thread Details

Hi everyone,

I am working on a PowerApps Canvas App where users can upload attachments using the Attachment Control. The uploaded files are then saved to either SharePoint Document Library or OneDrive via Power Automate.

Issue:

I have set the MaxAttachmentsSize property over 100MB, expecting users to upload files up to this limit.
However, the upload fails when trying to upload files larger than ~70MB.
The largest file I could successfully upload was about 70MB—any file above this size throws an error.
This happens regardless of whether I am saving the file to OneDrive or SharePoint.

Questions:

Is there a documented size limit for the PowerApps Attachment Control?
Why does the upload fail at ~70MB even though Power Automate supports larger files?
Is there a workaround to allow users to upload larger files?

Categories:

Power Apps Pro Dev & ISV

The PowerApps Attachment Control does have file size limits when dealing with SharePoint and OneDrive. Based on the official PowerApps guidance, the maximum file upload size per file is 50MB when using the Attachment Control with SharePoint lists. However, Power Automate can handle larger files, which is why you may see inconsistency in file size handling.

For SharePoint Document Libraries and OneDrive, the limit can be higher, but there are still performance constraints due to PowerApps' handling of file uploads.

You may try other ways like below -

Use Power Automate to upload files in chunks via SharePoint REST API or Graph API.
Upload files directly to OneDrive and trigger Power Automate to move them.
Store large files in Azure Blob Storage instead of SharePoint/OneDrive.