Would it be possible to pass a content:// URI or byte stream to be uploaded?

[Ansis100]

If you want to upload a file that was provided to you by the Storage Access Framework, you receive a content:// URI, which currently cannot be handled by Dart. The current accepted solution is to cache the file in the application directory and then upload it. This is not a great solution because devices with low storage space will not be able to upload files.

The content:// URIs are unsupported by Dart which means theoretically you could pass a URI to the enqueue or upload methods (instead of directory and filename) and do the actual file reading in Android-specific code, without caching. Alternatively, you could use a package like saf_stream, which provides a readable byte stream of a SAF file and pass that to the upload methods.

[781flyingdutchman]

That's an interesting idea, and seems feasible. You would set the directory to .root and the filename to the uri string. It would throw on platforms other than Android upon task creation (and only work for UploadTask to begin with). Byte streams are not a good idea, as they don't work when the app gets suspended.

I'm labeling this as an enhancement - it will take me time to get to this though.

[Ansis100]

If you have other priorities, I could eventually start some work on this.
I don't understand the reasoning behind setting directory to .root, though. Is .root some identifier I'm not familiar with?

[781flyingdutchman]

I actually think it's not that hard so can probably get it done soonish, just didn't want to delay today's release.
Ignore the .root point, as I'll probably just create a named constructor for this, just like there is one for forFile

[781flyingdutchman]

Implemented in 8.7.0