Resume-able Upload & Download Support

[draft1]

This is a great feature for File Sharing App.
Thanks!

[sergix44]

The current dropzone library doesn't include the option to pause the upload, so really possible to implement resumable uploads.

[draft1]

I thought it can be done with this:
https://gitlab.com/meno/dropzone/wikis/faq#chunked-uploads

[sergix44]

Writing partial chunks and finally reassemble them when using remote storages (ex: S3, Dropbox, etc) could be painfully slow, without a local file cache.
At the moment I don't think I am implementing something like this. Meanwhile, I close the issue, if someone wants to propose an implementation, they can send a PR.

I am not currently prepared to attempt an implementation, but I would check out tus.io. It seems to have an implementation figured out and is used in PsiTransfer.