Self Reference: Embedding Zoho Docs URL into Document for Public Access

Self Reference: Embedding Zoho Docs URL into Document for Public Access

My audience will have a paper version of a powerpoint slide which states "This presentation is available at    http://docs.zoho.com/file/uwwu4a66e90a7b89145978af25b1e41c147a8". (Actually it will be a tiny url).

How can I update the presentation on my computer with the url and then upload it to Zoho Docs so that the URL points to the revised version?

In more detail:

a) First I upload the presentation and get a public URL from Zoho Docs.

b) I update the presentation on my laptop. 

c) There is not mechanism within Zoho Docs to replace the old presentation sitting on Zoho Docs.  So I upload the revised presentation.  The link in the revised presentation points to the old version.  If I delete the old version, the URL is no longer valid.

Thanks T