How to Store and Upload Files in a Lovable Application

To add file uploads to a Lovable application, ask Lovable to use the current backend’s storage, specify allowed files and sizes and define who may upload, read and delete them. With Lovable Cloud, inspect files through More → Storage. Keep personal documents private; use public storage only for content intended to be accessible to anyone with its URL.

What you will learn and need

You will build a private document upload with validation and ownership. You need a backend-enabled project, a test account and harmless sample files. Start a fresh project with Join Lovable. Do not upload real identity documents while testing.

1. Decide what kind of files you accept

List the actual need: avatars, public product images or private documents. Decide formats, maximum size, retention and whether a file can be replaced or deleted. A filename extension alone is not proof of file type. Ask for backend validation in addition to helpful browser-side checks.

2. Choose private or public access

A private bucket is appropriate for user-owned documents. A public bucket makes files accessible to anyone with the URL; hiding that URL in your interface does not make the file private. Even with private storage, define ownership policies for upload, read, update and delete. Short-lived signed URLs can provide controlled temporary access, but they are bearer links: anyone receiving one may use it until it expires.

3. Ask for the complete upload flow

Add private document uploads using the current backend’s storage. Accept PDF files up to 5 MB as an application limit. Validate file type and size on the backend as well as in the browser. Only the signed-in owner may upload, list, read and delete their documents. Use unique safe paths, store necessary metadata, show progress and failure states, and avoid making the bucket public to solve access errors. Explain any infrastructure limits that affect the chosen cap.

The 5 MB cap is a chosen example for this feature—not a claim about Lovable’s maximum storage allowance. Adapt it to your use case and current service limits.

4. Inspect files and policies

Open More → Storage to inspect the bucket and sample file. Review storage policies through the policy tools, including More → Database → Manage → Policies where available. Ask Lovable to explain how each path maps to its owner and how requests are authorized. Keep sensitive filenames and credentials out of screenshots.

5. Verify upload, retrieval and deletion

Upload a valid sample file and confirm it opens after page reload. Try an unsupported type and an oversized file; both should be rejected clearly. Use a second account and confirm it cannot list, read or delete the first account’s file. Test signed-out access too. Delete the sample and verify both the metadata and stored object are handled consistently.

Troubleshooting and FAQs

Upload succeeds but the image or document does not load

Check whether the UI is using a public URL for a private object, an expired signed link or the wrong file path. Do not change the bucket to public as a shortcut.

Why are there duplicate or orphaned files?

Replacement and failure handling may be incomplete. Ask Lovable to clean up superseded files and handle metadata-write failures without deleting the wrong object.

Are files included in a database export?

No automatic inclusion should be assumed. Database backups and storage files are different; download or back up storage separately as required.

Does private storage scan uploads for malware?

Do not assume it does. If your app accepts risky documents or serves downloads to others, define and verify a scanning strategy separately.

Official sources and next steps

Read Lovable Storage, access policies and database backups. Continue with the private-data guide below and test uploads on a genuinely remixable project before using real files.