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Every project keeps files in two places you can browse in the preview side of the project page: You can upload into either tab, and you can download the entire Code tree as a zip from the bottom of the project page.

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Download your whole source code

On an open project, look at the bottom-right of the preview / project chrome (the bottom bar under the live preview).
  1. Open your project
  2. Find the Download control in the bottom bar (download icon; tooltip: Download source code)
  3. Click it
Builder packages the current Code volume into a zip and saves it locally as: your-project-name-source-code.zip
The zip reflects the code for the version you’re currently previewing. It does not include the Docs tab. For a remote copy of the repo, use GitHub Sync instead.
On mobile, the same action uses a file-download icon in that bottom bar.

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Upload files

Open the Code or Docs file tree on the project page (Files / Documents sidebar next to the editor).

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Upload a single file

  1. In the file tree header, click the Upload icon (tooltip: Upload file on Code, Upload document on Docs)
  2. Pick a file from your computer
  3. In the dialog, choose a destination folder (leave blank for the volume root) and optionally rename the file
  4. Click Upload
If the name already exists with a different extension, Builder asks you to confirm before overwriting.

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Upload a folder or many files

  1. Click the Upload folder control in the file tree header, or drag files/folders onto the file explorer
  2. Confirm the destination folder — folder structure is preserved
  3. Click Upload
Limits and filters:
  • Total selection size up to about 500 MB
  • Common junk is skipped automatically (for example .DS_Store, Thumbs.db, node_modules, .git)
Drag-and-drop works the same way: drop onto the explorer, then confirm destination.

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Create empty files or folders

From the same file tree you can create a new file/document or folder, including nested paths like design/mockups.

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Tips

  • Select a folder in the tree first if you want uploads to default into that folder
  • Use Docs for briefs and reference material; use Code for anything the app should run
  • For cloud files you don’t want to re-upload, connect Google Drive or Dropbox
  • To attach a few files to a chat message instead of the project tree, use the composer attach / paste flow described in Prompting

GitHub Sync

Push the project to a GitHub repository.

Data connectors

Use Drive or Dropbox folders as AI sources.
Last modified on August 3, 2026