Brian K wrote:
Can someone submit their work in handwritten form?
Not on Upwork. If you want to send handwritten work, you would still have to scan your work and then send the scanned copy electronically.
I have in fact, seen some clients who require 'hard copy' editing. This involves sending work by post. In this case, the client must establish a formal Upwork contract first, so that addresses can be exchanged. However, postage and packaging is extremely expensive, so between continents, it is really not a great option.
I do not recommend this way of working unless you have years of experience and know exactly who your client is.
re: "Can someone submit their work in handwritten form?"
If a client wanted work submitted in handwritten form, they would specify this in the job post.
"I have written a poem. I need a talented caligrapher to write it by hand. No computer fonts. This must be written using real ink and parchment that I will send to you at your address."
Otherwise, if you don't see an explicit request for work to be written by hand, then the client expects a digital file.