Description

Using XMLHttpRequest to upload a JPEG on IOS, increases the file size. Sending a compressed JPEG with XMLHttpRequest is uploading a file of which the file size is increased.

Executing the following will code will trigger the behaviour

const xhr = new XMLHttpRequest();
xhr.open('PUT', <FileUploadURL>);
xhr.send({uri: <Compressed JPEG uri>});

It seems to be that the following code is being executed on the IOS side

Libraries/Image/RCTImageLoader.mm
1104:      imageData = UIImageJPEGRepresentation(image, 1.0);

From what I understand, this code is uncompressing and then recompressing the JPEG file using the compressing value supplied to the call (1.0).

React Native version:

0.63.3

Steps To Reproduce

Provide a detailed list of steps that reproduce the issue.

1. Have a compressed JPEG file available
2. Execute the code as provided above
3. Inspect the difference between the original and the uploaded file

Expected Results

I expect that the original file is being uploaded, not a recompressed version with a different amount of compression