Form 21a Document Upload UI Implementation

[williamphelps13]

Problem

The Form 21a V3 Designs have a number of Multiple File Upload fields:

Our implementation in staging uses a single file upload since it is the only file upload that had a form pattern.

Implementation Details

• This slack post (it is in #va-forms-engineering group if need to request access) discuss single and multiple field upload
  • Single upload PR
  • Multiple upload PR
• This slack post by William discussing the best path forward for our file upload (also in #va-forms-engineering) and discusses the above single file upload being used by our team after it was completed including a bug in the document upload review.
• The first person I would talk to is the person from the first slack post, Michael Clement (Upcoming paternity leave - exp. 9/9-10/4), since his multi file upload solution potentially would completely solve our problem (including above review page bug)

Mockups/Designs

https://www.figma.com/design/2afIGOMII0uRI5ck1dWo1w/Form-21a---Apply-for-Accreditation-(CA-%26-Attorneys)?node-id=1026-23682&t=HkI5CS1sw6qhh3TS-4

Acceptance Criteria

• [ ] Implement multiple document upload and replace the single file upload
• [ ] Ensure its working properly on the summary page
• [ ] Desired file types are .pdf, .doc, .docx, .jpg, .png, or .txt.
• [ ] Determine how we will be storing this data in vets-api (or wherever we determine it should be stored) before it get submitted to GCLaws Note: we won't be incorporating building this multi-file upload pattern into platform as part of this ticket (will follow up with a separate ticket if time permits to incorporate this for platform)

Automated Testing

• If this issue becomes an implementation then the implementation should include e2e testing

Accessibility (A11y) Testing

• There are no A11y errors in the console
• The developer does not degrade built in VA Form Library A11y in order to implement custom functionality

[hdbaines]

Note: we won't be incorporating building this multi-file upload pattern into platform as part of this ticket (will follow up with a separate ticket if time permits to incorporate this for platform)