JavaScript Library For Simultaneous & Resumable Uploads – Resumable.js
Resumable.js is a JavaScript library providing multiple simultaneous, stable and resumable uploads via the HTML5 File API.
The library is designed to introduce fault-tolerance into the upload of large files through HTTP. This is done by splitting each files into small chunks; whenever the upload of a chunk fails, uploading is retried until the procedure completes. This allows uploads to automatically resume uploading after a network connection is lost either locally or to the server. Additionally, it allows for users to pause, resume and even recover uploads without losing state.
I usually just use blueimp for file upload but having issues with it. Hopefully this is easy to use also