Microsoft Forms File Upload: Limits, Greyed Out Fix & External Users

Microsoft Forms includes a file upload question type that lets respondents attach documents, images, and other files within a form. It works for internal use — but strict limits on file size, account requirements, and external access trip up most teams.

This guide covers how to add file uploads, the exact size and file type limits, why the upload option gets greyed out, where files are stored, and what to do when you need to collect files from people outside your organization.

How to Add File Upload to Microsoft Forms

Adding a file upload field takes about a minute. You need a Microsoft 365 work or school account — file uploads are not available on personal Microsoft accounts.

Step 1: Create a new form

Go to forms.office.com and sign in with your work or school account. Click New Form to start, or open an existing form.

Step 2: Add a new question

Click Add new to insert a question. You will see the standard question types: Choice, Text, Rating, and Date.

Step 3: Select "File Upload"

Click the More question types menu (the three dots or chevron) and select File Upload. Microsoft Forms will display a notice that a OneDrive for Business folder will be created to store uploaded files. Click OK to proceed.

Step 4: Configure file upload settings

Customize three settings on the file upload question:

• File number limit — Maximum files per respondent per question (up to 10).
• Single file size limit — Maximum size per file, from 10 MB up to 1 GB depending on your plan.
• File type restrictions — Restrict to Word, Excel, PPT, PDF, Image, Video, or Audio. Leave open to accept any type.

Step 5: Send the form

Click Collect responses to distribute your form. By default, the form is set to "Only people in my organization can respond." Keep this setting — file upload only works when respondents are authenticated. Changing to "Anyone with the link" disables file upload.

Microsoft Forms File Upload Limits

Microsoft Forms imposes limits at the file level, the question level, and the storage level.

The default is only 10 MB per file — low enough to block most video files and large PDFs. If you are collecting anything beyond simple documents, increase this to the 1 GB maximum in the question settings. Respondents who exceed the limit see an error and cannot submit.

Allowed file types

When you enable file type restrictions, Microsoft Forms offers these categories:

• Word — .doc, .docx
• Excel — .xls, .xlsx
• PPT — .ppt, .pptx
• PDF — .pdf
• Image — .png, .jpg, .jpeg, .gif, .bmp
• Video — .mp4, .mov, .wmv, .avi
• Audio — .mp3, .wav, .wma

There is no option for custom file extensions. If you need ZIP archives, CAD files (.dwg), JSON, or any specialized format, you must leave file type restrictions off entirely.

Where Are Uploaded Files Stored?

Every file uploaded through Microsoft Forms goes to the form creator's OneDrive for Business account — not SharePoint, Teams, or any shared location.

The storage path follows this structure:

OneDrive for Business > Apps > Microsoft Forms > [Form Name] > Question > [Respondent Name]_[File Name]

Each form gets its own folder, and each file upload question gets a subfolder. File names are prefixed with the respondent's name (from their organizational account) so you can identify who uploaded what.

Three storage details that matter:

• Uploads count against the form creator's OneDrive quota. If your OneDrive fills up, respondents get an error when trying to upload.
• The folder structure is created automatically the first time you add a file upload question.
• Deleting a form does not delete the uploaded files. You must remove them from OneDrive separately to reclaim storage.

Why Is File Upload Greyed Out in Microsoft Forms?

You try to add a file upload question and the option is greyed out or missing entirely. Four causes account for nearly every case.

Cause 1: The form is set to "Anyone with the link"

This is the most common cause. Microsoft Forms disables file uploads when responses are open to "Anyone with the link." File upload requires authenticated respondents. (If you need anonymous responses without file uploads, see how to make Microsoft Forms anonymous.)

The fix: Go to your form's settings. Under "Who can fill out this form," change to "Only people in my organization can respond." The file upload option becomes available immediately.

Cause 2: You are using a personal Microsoft account

File upload requires a Microsoft 365 work or school account. If you are signed in with a personal Outlook.com, Hotmail, or Live account, the file upload option does not appear.

The fix: Sign in with your organization's Microsoft 365 account. Without a work or school account, you cannot use file uploads in Microsoft Forms.

Cause 3: Your admin has disabled file uploads

Microsoft 365 administrators can disable file uploads in Forms through the admin center. This is common in organizations with strict data governance requirements.

The fix: Contact your admin. They can enable file uploads in Microsoft 365 admin center > Settings > Org settings > Microsoft Forms.

Cause 4: The form is embedded and respondents are not signed in

File upload works in embedded forms only if the respondent is signed in to their organizational Microsoft account. On a public website where visitors are not authenticated, the file upload field is greyed out or shows an error.

The fix: Ensure respondents are signed in before accessing the embedded form. For public-facing file collection, embedded Microsoft Forms will not work.

Quick diagnostic checklist

Can External Users Upload Files to Microsoft Forms?

No. Microsoft Forms does not support file uploads from users outside your organization. This is a hard limitation by design, not a configuration issue.

File uploads require respondents to authenticate with a Microsoft 365 organizational account. Microsoft restricts this to users within the same tenant to prevent unauthorized access to corporate OneDrive storage. If you change the sharing setting to "Anyone with the link" to allow external access, the file upload question is automatically disabled — you will see a notice: "File upload is only available when Microsoft Forms requires sign-in to respond." Our guide on sharing Microsoft Forms with external users covers all available sharing configurations and their restrictions.

What this means in practice

• Clients outside your organization cannot upload files through your form, even if they have their own Microsoft 365 account in a different tenant.
• Vendors and contractors without Microsoft 365 accounts are locked out.
• Public-facing forms (event registrations, applications, intake forms) cannot include file upload questions.

Workaround 1: OneDrive file requests

OneDrive for Business has a "Request files" feature that creates an upload link for external users. Recipients upload files without needing a Microsoft account, and files go to a specific OneDrive folder.

Limitations: OneDrive file requests are upload-only. There is no form builder, so you cannot collect names, project details, or other information alongside the files. You also cannot restrict file types, and the feature is turned off by default in many organizations.

Workaround 2: Use a dedicated file collection tool

If you need form fields alongside file uploads from external users, a tool like File Request Pro fills the gap. External users upload files without any account. Files route to your OneDrive or SharePoint through a native integration, and you can add form fields, restrict file types, brand the upload page, and send automated reminders.

How to Upload Files from Microsoft Forms to SharePoint

Files uploaded through Microsoft Forms go to OneDrive for Business by default — not SharePoint. If your team needs uploaded files in a SharePoint document library, you have two options.

Option 1: Power Automate flow

Microsoft Power Automate can automatically copy files from OneDrive to SharePoint each time a form response is submitted.

Setup steps:

1. Go to make.powerautomate.com and sign in.
2. Create an Automated cloud flow with the trigger "When a new response is submitted" (Microsoft Forms).
3. Add "Get response details" to retrieve the form data.
4. Add "Get file content" (OneDrive for Business) using the file upload response value.
5. Add "Create file" (SharePoint) — select your site, document library, and file name.
6. Save and test.

This works, but you now have a flow to maintain. If it fails — due to a connection issue, renamed form, or quota error — files pile up in OneDrive without reaching SharePoint, and nothing alerts you.

Option 2: File Request Pro with native SharePoint integration

File Request Pro connects directly to SharePoint. Uploaded files go straight to your chosen document library — no OneDrive intermediary, no Power Automate flow to maintain. External users can upload without a Microsoft account, and files are auto-organized by respondent name, email, or custom field.

Microsoft Forms File Upload vs. Dedicated File Collection Tools

Microsoft Forms handles basic internal file collection. For files from clients, vendors, or anyone outside your tenant, the limitations stack up fast.

When Microsoft Forms is the right choice: Internal file collection where everyone has a Microsoft 365 account, branding is not needed, and OneDrive storage is acceptable.

When you need a dedicated tool: External clients or public-facing forms, direct SharePoint delivery, branded upload pages, or automated follow-up for missing documents.

Microsoft Forms File Upload FAQ

Can respondents upload files without a Microsoft account?

No. File upload requires a Microsoft 365 work or school account. Personal accounts (Outlook.com, Hotmail, Live) do not support file uploads in Forms.

Where do uploaded files go?

Files are stored in the form creator's OneDrive for Business under Apps > Microsoft Forms > [Form Name]. Each question gets a subfolder, and file names include the respondent's name. All uploads count against the creator's OneDrive quota.

What is the maximum file size?

The maximum is 1 GB per file for Microsoft 365 Business and Education accounts. The default is 10 MB, so you need to increase it manually in the question settings.

Why does it say "File upload is only available for forms that require sign-in"?

Your form is set to "Anyone with the link can respond." Microsoft requires authentication for file uploads. Change to "Only people in my organization can respond" to enable file uploads.

Can I collect files from external clients?

Not through Microsoft Forms. File upload is restricted to your organization's Microsoft 365 tenant. For external file collection, use OneDrive file requests (upload-only, no form fields) or a tool like File Request Pro that supports external uploads with form fields.

How do I move uploaded files to SharePoint?

Create a Power Automate flow triggered by new form responses that copies files to your SharePoint document library. Or use a tool with native SharePoint integration to skip the OneDrive step entirely.

Can I use file upload in Microsoft Forms for Education?

Yes, if your institution's admin has enabled it. Many schools disable file uploads to manage storage or meet compliance requirements. Check with your IT department if the option is greyed out.

What happens when OneDrive storage is full?

Respondents see an error and cannot upload. Free up OneDrive space, or ask your admin to increase your storage quota.

Can I get notified when someone uploads a file?

Yes. In your form, click the three-dot menu and select "Get email notification of each response." You will receive an email when someone submits, but uploaded files are not attached — open OneDrive to access them.