My paper needs to be embargoed as according to the publisher’s self-archiving policy, but my funders want to see my paper’s full text as open access in DR-NTU now, what can I do?

You may attach “Submitted manuscript” (ie. draft manuscript before peers-review) of the paper for DR-NTU submission first in order to satisfy your funder’s open access request. When the embargo period expires, you can send the “accepted version” (in PDF format) to the library to ask for file replacement.