Keynote question

[Raven]

I created a Keynote presentation. About 20 slides with about 2 dozen photos. When I exported the file as a PDF to be emailed it was over 70mb in size. Too large to email.
So, I need to reduce each photo's file size from 3-4 mb each down to 400 kb. But the originals are all over in my 20,000 photo library.
Is there an easy way to gather/package all the images like one can do in Adobe InDesign? I see no linking feature that would help. Suggestions? :-)

[Paddy]

I suspect you may have figured out an answer to this by now, but in case you haven't:

https://www.laptopmag.com/articles/reduce-file-size-keynote-presentation is one option.

Another is using Adobe's PDF settings if you have the full version of Acrobat, which allows you to select the quality of the PDF AND the resolution of the images.