Ionic native fileTransfer multiple upload

is it possible to use observable.forkjoin() with fileTransfer.upload() ?
or any other way to achieve this?

i want to upload files to cloudinary. i have use angular and observable.forkjoin() before but only succeeded with base64 data.

when i tried retrieving base64 for file greater than 20MB,app crashes because of memory issue

so now i need to use native_uri and managed to upload to cloudinary using fileTransfer.upload(). but only single upload.