Well, for me at least the difference is that uploading implies a single destination (I know this doesn't always hold, but conceptually I think it does. Otherwis

Well, for me at least the difference is that uploading implies a single destination (I know this doesn't always hold, but conceptually I think it does. Otherwise there are multiple distinct uploads) And sharing implies multiple agents, be them on a single or multiple destinations. I know my definition doesn't seem clearcut, but I think the implication is that you could share by means of uploading or you could share without uploading anything (excepting maybe "uploading" the link to someone else), but you can also upload without sharing anything (i.e. I upload to my private server) and that's why I consider them different concepts.