File Upload
Uploads with drag-and-drop, progress, and real error handling.
What it adds
A file upload that shows progress, validates properly, and fails gracefully.
What your agent is told to do
4
What your agent is told to do
4-
1
Support both drag-and-drop and a normal file picker — never drag-only, which is unusable on touch and by keyboard.
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2
Show real upload progress, and allow cancelling an in-flight upload.
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3
Validate type and size on the client for fast feedback, and AGAIN on the server. Client validation is trivially bypassed.
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Never trust the file's declared MIME type or extension — verify server-side.
Edge cases it handles
5
Edge cases it handles
5- A file over the size limit must fail before uploading, not after.
- A dropped connection mid-upload must report failure and allow retry.
- Uploading a file with the same name as an existing one must not silently overwrite it.
- Filenames must be sanitized — a filename is untrusted user input and a path traversal vector.
- The upload must not be the only thing that saves the form.
Definition of done
7
Definition of done
7- Drag-and-drop and click-to-browse both work.
- Progress is shown and uploads can be cancelled.
- Type and size are enforced server-side, not just client-side.
- Filenames are sanitized and never used raw as paths.
- Failures are reported with a retry path.
- The feature matches the existing design system.
- No existing functionality is broken.
Related features
Voice Dictation
Voice Dictation
Put a microphone in text fields so people can speak their input instead of typing it.
What it does
A dictation control on the app's longer text inputs that transcribes speech into the field as the user talks.
How it works
- 1 Add the control to the fields where typing is genuinely tedious: long descriptions, notes, comments, and message bodies. A microphone on a postcode field is clutter.
- 2 Show interim results in the field as they arrive, visually distinct from committed text, so the speaker can see it is working and correct course before they finish.
- 3 Reuse the app's existing Voice Transcription for the server-side path so one recognition configuration and one set of language settings serve both dictation and recorded audio.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/voice-dictation
Help Text Pattern
Help Text Pattern
Put field guidance in one predictable place, phrased the same way every time.
What it does
A consistent treatment for the short explanatory text that sits with a field and its control.
How it works
- 1 Collect the guidance the app currently scatters across placeholders, tooltips, asterisked footnotes, and modal help, and move it into one slot beneath the field.
- 2 Keep guidance that is required to complete the field permanently visible. A format rule hidden behind a hover target is not available to a touch user or a keyboard user.
- 3 Write help as the rule the user needs before typing — the accepted format, the consequence of the choice — not as a restatement of the label.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/help-text-pattern
Form Section Pattern
Form Section Pattern
Break long forms into labelled sections people can scan instead of read.
What it does
A section pattern grouping related fields under a heading, a description, and its own actions.
How it works
- 1 Find the forms that have grown past a screenful — settings, profiles, checkout, configuration — and group their fields by the question each group answers, not by the table the columns come from.
- 2 Give each section a heading in the document's heading order and an optional one-line description, so screen reader and keyboard users can jump between sections.
- 3 Allow at most one level of nesting. A section inside a section inside a tab gives the user no orientation and pushes the fields into a narrow gutter.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/form-section-pattern
How it works
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1
Copy the link
Grab the Markdown instruction URL for this feature.
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2
Give it to your AI
Paste it into Claude Code, Cursor, v0, Lovable — whatever you build with.
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3
It inspects, then implements
Your agent reads your existing app first, then adds the feature to fit it.
Works with your stack
These instructions are written to adapt. They tell the agent to detect your framework, match your existing design system, and reuse what you already have — rather than assuming a particular stack.
Need it tighter than that? Customize the feature and tell it exactly what you're running.