const info = await FileSystem.getInfoAsync(recording.getURI());
        console.log(`FILE INFO: ${JSON.stringify(info)}`);

FILE INFO: {"size":548864,"modificationTime":1553094025.727294,"uri":"file:///var/mobile/Containers/Data/Application/8488FB96-5F96-4690-84CC-C52B4E2136C8/Library/Caches/ExponentExperienceData/%2540christophera%252Fencounters-app/AV/recording-5C8E7D16-BA89-4DD7-B249-D0865D191BDD.caf","isDirectory":false,"exists":true}

const response = await fetch(fileURI);
        const blob = await response.blob();

{"_data":{"blobId":"260ee7da-4e7d-401a-9243-09f1cd85149f","offset":0,"size":243976,"type":"","lastModified":1553093860777}}

let formData = new FormData();
        formData.append('soundBlob', blob, fileName);
        console.log(formData);
        const options = {
            method: 'POST',
            body: formData,
            headers: {
                'enctype': 'multipart/form-data',
            },
        };
        await fetch(fileAPI_server, options)
            .then(response => console.log(response.status))
            .catch(error => console.log('Error:', error));