Uploading large files > 10 MB could crash the application

[nilsreichardt]

Problem

When uploading a file larger than 10MB (actual size depends on device and available RAM), the application may crash.

This is because the entire file is loaded into RAM as a variable.

Possible solution

To avoid loading the whole file, we can use the chunk stream: https://github.com/miguelpruivo/flutter_file_picker/wiki/FAQ#q-how-do-do-i-use-withreadstream. However, Firebase doesn't provide an easy way to upload a file in chunks.

Google Cloud Storage does support uploading a file in chunks: Resumable Uploads:

Use a resumable upload when you are uploading large files or uploading over a slow connection. For example file size limits when using resumable uploads, see Upload size considerations.

https://cloud.google.com/storage/docs/resumable-uploads

Google Cloud Storage gives you a URL. You may be able to use this URL to upload the chunks using one of the following packages:

https://pub.dev/packages/chunked_uploader
https://pub.dev/packages/large_file_uploader
https://pub.dev/packages/upload_largest_files