Trouble uploading media (images) to twilio programmable chat in react-native - react-native

Question

I'm implementing programmable-chat in react-native using the npm package. Unfortunately, I'm stuck on being able to correctly upload messages with images to twilio. The twilio js documentation outlines 3 ways to create a Media Message. Sending: 1) FormData (doesn't seem applicable to me in react-native?), 2) a String, or 3) a Buffer.
I've tried many variations at this point and am stumped. I've been all over the place with both react-native-fs and react-native-fetch-blob and haven't cracked it yet.
Everything I try results in failure or in a String being uploaded. When the String is uploaded, I can complete a round trip by fetching the created Media Message, getting the the temporary url of the media attachment, manually fetching the String stored at that url, and then crafting a base64 data uri for the Image element with the fetched String. But I'm 99% sure that is 'doing it wrong'. If I do it right, Twilio should be storing an actual image for me and giving me a temporary url that I can directly feed to my Image element, right?
To sum up: I can get a base64 encoded string to be stored in twilio, but for the life of me I can't figure out how to get the image binary up there so as to be directly accessible when hitting the url it is at.
I feel like I've got to be missing something simple, but I'm out of ideas at the moment. Is there a way to get a Buffer set up in react native? Should I be trying something with FormData?

Answer 1

I finally figured this out. This was just a problem not knowing how to get the file into a buffer in react native. I was finally able to get this working with a combination of react-native-fs and buffer. The code looks something like:
import RNFS from 'react-native-fs'
myMethod(twilioChannelObject, filePathString) {
RNFS.readFile(filePath, 'base64').then((data) => {
var Buffer = require('buffer/').Buffer
data = Buffer.from(data, 'base64')
twilioChannelObject.sendMessage({
contentType: 'image/png',
media: data
}).then(id => {})
})
}
This probably isn't the best practice way to solve the problem, but it got it to work for me, so moving on for now.