If you need to include existing presentations directly into an activity or NILE site (rather than linking to a file that students may or may not be able to open), SlidSshare may be the answer. It requires an account or can be linked to an existing LinkedIn account.
For some applications (Xerte for example) the embed code needs to be adjusted slightly. Change:
<iframe src=“//www.slideshare.net/slideshow/embed_code/36985406″ …./div>
<iframe src=“https://www.slideshare.net/slideshow/embed_code/36985406″ …./div>
In NILE there is also a mashup tool to include SlideShares directly.
Here’s an example: