We (MrA Developers) have recently completed a project on fiverr and intended to deliver it.When we opened the deliver project page there was no option of Upload Work.Its a major bug that needs to be solved.It may cause some sellers to get late in the delivery of their projects.
FIX : if got a solution to it by opening fiverr in Internet Explorer.It worked fine there
Check you’re not disallowing any required scripts on the delivery page of Fiverr in Firefox by any add-ons.
If this happens, try sending work as an attachment in a message to a buyer. If this works, then send an empty delivery saying ‘see last message attachment.’ This happens a lot to me when I am delivering work via my tablet, just with Internet Explorer, not Firefox.
Thank you for your kind reply,by the way what you sell on fiverr