1. Open Adalo and head over to your app.
2. Click the "+" button next to “Collections.”
3. Give your new collection a name, like "Uploaded Files."
4. Add the fields you need, such as "File URL" (URL) and any other relevant fields, like "User ID" to link files to specific users.

1. Drag and drop a Form component onto your screen from the left panel.
2. Configure the Form's settings:

• Set the Form action to "Create a new record in Upload Files".

1. Add the necessary input fields to your form, like a Text Input for the file name.
2. For file uploads, add a File Picker component to your form.

1. With the File Picker component selected, go to its settings.
2. Bind the File URL to the "File URL" field in your Upload Files collection. This way, when a user uploads a file, its URL will be saved in the collection.

1. Choose an external storage service, like AWS S3 or Firebase Storage.
2. Set up the storage service to accept file uploads via an HTTP request.

1. Get the API endpoint URL from your external storage setup.
2. Create an API in Adalo that can send an HTTP POST request to this endpoint.
3. Use parameters to send the file data (use the URL received from the File Picker).

1. Go to the actions of your submit button in the Form component.
2. Add a "Create" action to save the file URL to the Upload Files collection.
3. Add an additional "Custom Action" that uses your external storage API.
4. Make sure the Custom Action sends the file URL and any other required data to your external storage API.

1. Preview your app and go to the screen with your custom file uploader.
2. Use the uploader to select and upload a file.
3. Check to make sure the file URL is saved in your Upload Files collection.
4. Verify that the file is successfully stored in your external storage service.

1. Create a new screen or component where users can view their uploaded files.
2. Use a list component and connect it to the Upload Files collection.
3. Display relevant file information, like the file name and a link to the file URL.

Following these steps will help you create a functional custom file uploader in Adalo, ensuring that users can upload files and that these are correctly stored and referenced.