AWS S3 Upload / Auto Download / Pull Custom .OBJ files from internet

[charlesweng]

Acceptance Criteria

1. AWS S3 Upload

-    The application must allow uploading .OBJ files to a specified S3 bucket.
-     The upload operation must use AWS SDK for iOS with appropriate authentication (e.g., Cognito or IAM role-based credentials).
-     A file picker must be implemented to select .OBJ files locally for upload.
-     The system must validate that only .OBJ files are uploaded (file type validation).

2. Auto Download from AWS S3

-     The application must automatically download specific .OBJ files from an S3 bucket based on a predefined trigger or condition (e.g., button tap or periodic check).
-     Files must be downloaded to a local directory on the device (e.g., within the app sandbox).

3. Pull Custom .OBJ Files from the Internet

-     The app must support downloading .OBJ files from any URL provided by the user.
-     The user must be able to input a valid URL via a text field or paste functionality.
-     The app must validate the URL and confirm it points to a downloadable .OBJ file before proceeding.
-     The downloaded .OBJ file must be stored securely in the app's local directory.