Step-by-step guide to adding a file upload field to your UniLink forms — including accepted file types, size limits, storage, and how to access uploaded files in your responses.
Sometimes a text field is not enough. Hiring enquiries need a resume. Portfolio submissions need images or PDFs. Support requests need screenshots. Adding a file upload field to your UniLink form lets respondents attach files directly without you needing to chase them via email. This guide covers everything from adding the field to accessing the files after submission.
What the File Upload Field Does
The File Upload field adds a drag-and-drop upload area (with a browse button fallback) to your form. When a respondent submits the form, the file is uploaded to UniLink's secure storage and linked to that specific form response. You can then view and download the file directly from the Responses section of your dashboard, or receive it as an attachment in your notification emails.
You control exactly what kinds of files are accepted and how large they can be. Restricting file types prevents unexpected or unsafe uploads — for example, a resume collection form should accept only PDF and DOCX, not executable files. Setting a maximum file size prevents oversized uploads from slowing down the form and consuming excessive storage.
The file upload field supports single-file and multiple-file modes. In multiple-file mode, respondents can attach several files in one submission — useful for portfolio submissions, project deliverables, or multi-document applications where attaching everything in one go is more convenient than multiple separate submissions.
How to Get Started With File Upload in UniLink Forms
- Open your form in the builder — go to Forms in your UniLink dashboard and either create a new form or click Edit on an existing one. The form builder opens with the field panel on the right.
- Add the File Upload field — click + Add Field and select File Upload from the field type list. The field appears in the form canvas and the settings sidebar opens for that field.
- Set the field label — replace the default label with a clear instruction such as "Upload your resume (PDF only)" or "Attach supporting documents". A specific label reduces confusion about what format is expected.
- Configure accepted file types — in the field settings, click the Accepted File Types selector. Choose from the preset categories (Images: JPG, PNG, GIF, WEBP; Documents: PDF, DOC, DOCX, TXT; Spreadsheets: XLS, XLSX, CSV) or enter custom MIME types for more granular control. Leave the field unrestricted only if you genuinely need to accept any file type.
- Set the maximum file size — enter the maximum size in megabytes. UniLink supports up to 50 MB per file. For most document use cases, 10 MB is generous. For images or design files, 25–50 MB may be appropriate. The form will show respondents the file size limit and reject oversized files with a clear error message.
- Enable multiple-file mode if needed — toggle Allow Multiple Files to let respondents upload more than one file in a single field. Optionally set the maximum number of files per submission to prevent abuse.
- Mark the field as required if needed — if a file upload is mandatory for the form to be useful (e.g., a job application without a resume is incomplete), toggle the Required switch. Respondents will not be able to submit the form without attaching at least one file.
How to Access Uploaded Files in Form Responses
- Navigate to Form Responses — go to Forms → [Your Form] → Responses. Each row represents one submission.
- Open an individual response — click a row to expand the full response details. File upload fields show the uploaded file name and a Download link next to each file.
- Download the file — click Download to retrieve the file to your computer. The file retains its original name and extension as uploaded by the respondent.
- Enable notification emails with file links — go to Form Settings → Notifications. Set up an email notification to yourself (or your team) on each new submission. Check the Include uploaded files option so the notification email contains a direct download link to each attached file without you needing to log in to the dashboard.
- Export responses with file links — when exporting responses to CSV or Excel, file upload columns are exported as direct download URLs. You can share these links with team members or import them into other tools for processing.
- View file metadata — in the response detail view, hovering over a file shows its upload timestamp, file size, and file type. This metadata is also included in webhook payloads if you have webhook delivery configured for the form.
Key Settings Explained
| Setting | What it controls | Best practice |
|---|---|---|
| Accepted file types | Which file extensions and MIME types respondents are allowed to upload | Restrict to only what you need (e.g., PDF + DOCX for documents); never allow executable types (EXE, JS, PHP) unless you have a specific reason |
| Maximum file size | The largest file (in MB) the field will accept from a single file upload | Set to the minimum that covers your realistic use case; 10 MB covers most documents, 25 MB covers high-res images |
| Allow multiple files | Whether respondents can upload more than one file in a single field | Enable only when multiple attachments are genuinely expected; set a max file count to prevent runaway uploads |
| Required toggle | Whether a file must be attached before the form can be submitted | Require only for forms where a missing file makes the submission unusable; otherwise leave optional to avoid abandonment |
| Notification email with file links | Whether new-submission emails include download links to uploaded files | Enable this so team members can access files without logging into the dashboard every time |
How to Get the Most Out of File Upload Forms
The most effective file upload forms are specific about what they need. Instead of a generic "Upload a file" label, write "Upload your portfolio (PDF or JPG, max 10 MB)" or "Attach your signed contract (PDF only)". Specificity reduces uploads that are the wrong format, too large to process, or simply not what you were asking for.
Combine the file upload field with other field types to collect structured context alongside the file. A job application form might include name, email, position applying for (dropdown), years of experience (number), and then the file upload at the end. When you open the response, you have the structured data and the document together in one place.
If your workflow involves multiple people reviewing uploaded files — for example, a design review process or a content approval workflow — use the export feature to generate a shared CSV with direct download links. Team members can access files without needing a UniLink account, which speeds up collaboration without requiring you to manage additional user seats.
Set up a dedicated notification email for file-upload forms and route it to a team inbox rather than a personal address. This ensures uploaded files are not missed when the primary recipient is unavailable, and creates a natural audit trail of what was received and when.
Troubleshooting Common Issues
| Problem | Likely cause | Fix |
|---|---|---|
| Respondent gets "file type not allowed" error | The uploaded file's extension is not in the accepted file types list | Review and update the accepted file types setting; communicate the allowed formats clearly in the field label or helper text |
| Uploaded file not appearing in responses | Form submission completed but the upload timed out or failed mid-transfer | Ask the respondent to re-submit; check that the file was under the size limit; verify your internet connection was stable during upload |
| Notification email arrives without the file attachment | "Include uploaded files" option is not enabled in notification settings | Go to Form Settings → Notifications and enable the Include uploaded files toggle; save and test with a new submission |
| Download link in CSV export has expired | Exported URLs are time-limited for security reasons | Re-export the responses from the dashboard to generate fresh download URLs; download files directly from the Responses view for permanent access |
Pros
- Eliminates the need to request files separately via email — everything arrives in one form submission
- Accepted file type and size restrictions prevent unsuitable or oversized uploads automatically
- Files are stored securely and linked directly to the corresponding form response for easy reference
- Notification emails with file links let team members access uploads without a dashboard login
Cons
- Large file uploads (close to the 50 MB limit) can make form submission slow on slower internet connections
- Exported CSV download URLs are time-limited and must be refreshed periodically for ongoing access
- Multiple-file mode without a file count limit can result in unexpectedly large storage usage if not restricted
Frequently Asked Questions
What is the maximum file size I can accept?
UniLink supports file uploads up to 50 MB per file. If you need to accept files larger than 50 MB, consider using a cloud storage link field instead — ask respondents to upload their file to Google Drive or Dropbox and paste the share link into a URL field on your form.
Where are uploaded files stored?
Files uploaded through UniLink forms are stored in UniLink's secure cloud storage. They are accessible only through authenticated download links generated within your account. Files are not publicly accessible via a guessable URL.
Can I accept image uploads and display them in the response view?
Yes. When the uploaded file is a supported image format (JPG, PNG, GIF, WEBP), the response detail view shows a thumbnail preview alongside the download link. This makes visual review of image submissions faster without needing to download each file individually.
Can I restrict uploads to PDF only?
Yes. In the Accepted File Types setting, deselect all presets and add only PDF (or application/pdf as a MIME type). The field will then reject any file that is not a valid PDF and show an error message to the respondent.
Can multiple team members access uploaded files?
Yes. Any team member with access to your UniLink account can view and download files from the Responses section. You can also export responses to a shared CSV with download links, or configure notification emails to a team inbox so uploaded files are immediately accessible to whoever needs them.
Key Takeaways
- The File Upload field in UniLink lets respondents attach PDFs, images, documents, and other files directly in a form submission.
- Configure accepted file types and maximum file size to keep uploads clean, relevant, and within storage limits.
- Uploaded files are linked to individual form responses and accessible via download links in the Responses view.
- Enable notification emails with file links so team members receive download access immediately after each submission.
- Combine the file upload field with structured fields (dropdown, text, email) to collect context alongside the file in one unified response.
Ready to start collecting file uploads?
Add a file upload field to your UniLink form in minutes and start receiving resumes, images, and documents directly in your dashboard.
Get Started Free